Solid state detection test paper for residual chlorine, preparation method therefor and residual chlorine detection method

Abstract

The present application provides a solid state detection test paper for residual chlorine, a preparation method therefor, and a detection method. The solid state detection test paper for residual chlorine comprises a base plate, and multiple test modules carried on the base plate. A test module comprises: a water-absorbing layer fixed on the base plate; a test paper fixed opposite to the water-absorbing layer, the test paper being loaded with an indicator and a fixing agent, an amount of color change of the indicator being positively correlated with a concentration of residual chlorine participating in the reaction, and the area of the test paper being smaller than that of the water-absorbing layer, and having water-absorption capacity lower than that of the water-absorbing layer; and a cover plate fixed on the base plate, pressing the test paper against the water-absorbing layer. By means of increasing a water volume, a color development effect can be correspondingly enhanced, thereby increasing the accuracy of residual chlorine testing. The cover plate can protect the water-absorbing layer and the test paper, reducing damage, and preventing sample overflow during testing, thereby further improving testing accuracy.

Description

Residual chlorine solid-state test paper, preparation method thereof and residual chlorine detection method TECHNICAL FIELD

[0001] The present application relates to the technical field of water quality detection, in particular to a residual chlorine solid-state test paper, a preparation method thereof and a detection method. BACKGROUND

[0002] Swimming pool water is disinfected by using a disinfectant containing chlorine. In the disinfection process, the disinfectant must reach a certain use concentration and maintain a certain residual concentration to play a persistent and efficient bactericidal effect. However, too high concentration will increase the cost and cause harm to the human body. Therefore, it is necessary to monitor the residual chlorine concentration in the water after disinfection. As for the content range of residual chlorine, some standards stipulate that the residual chlorine range of swimming pool water is 1-5 ppm, and some standards require that the residual chlorine content range of swimming pool water is 0.3-1 ppm.

[0003] The detection methods of free residual chlorine mainly include N, N-diethyl-p-phenylenediamine spectrophotometry and tetramethylbenzidine colorimetry. The principle is that the depth of reagent coloration is proportional to the content of free residual chlorine. Since the residual chlorine in water is affected by temperature, light and various oxidants, on-site and timely detection is required to ensure accuracy. However, the existing residual chlorine test paper on the market has a large detection range, and the detection precision of the lower limit of residual chlorine cannot be achieved. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the present application provides a residual chlorine solid-state test paper, a preparation method thereof and a detection method, which has the advantage of being able to realize high-precision measurement of low-range residual chlorine concentration sample solution.

[0005] The first aspect of the present application provides a residual chlorine solid-state test paper, comprising: a bottom plate, and a test module carried on the bottom plate; wherein the test module comprises:

[0006] a water absorption layer fixed to the bottom plate; and,

[0007] a test paper for dropping sample solution fixed opposite to the water absorption layer, the test paper being loaded with an indicator and a fixing agent whose oxidation discoloration degree is positively correlated with the concentration of residual chlorine participating in the reaction, and the water absorption capacity of the test paper being lower than that of the water absorption layer.

[0008] The above technical solution is realized. When the residual chlorine is detected, the sample liquid to be detected is continuously dropped on the test paper. Since the area and water absorption capacity of the water absorption layer are higher than those of the test paper, the sample liquid moves from top to bottom quickly under the action of the water absorption layer after being dropped on the test paper, thereby increasing the water flow per unit of test paper. The sample liquid continuously reacts with the indicator loaded on the test paper to achieve color development. Since the color change degree of the indicator is positively correlated with the concentration of the residual chlorine participating in the reaction, the corresponding residual chlorine concentration can be obtained according to the color development effect. By increasing the water flow, the color development effect of the solution under low residual chlorine concentration can be correspondingly enhanced, thereby achieving the purpose of increasing the residual chlorine test precision. The water absorption layer and the test paper can be protected by the cover plate to reduce damage and prevent the sample liquid from overflowing during the test, thereby further improving the test precision.

[0009] In some exemplary embodiments, a cover plate for pressing the test paper against the water absorption layer is fixed on the bottom plate. The water absorption layer is sealed in the cover plate, and the cover plate is provided with a test port for exposing part of the test paper to drop the sample liquid.

[0010] The above technical solution is realized. The test paper is pressed by the cover plate, so that the test paper and the water absorption layer are combined more closely, the sample liquid diffusion speed is improved, and the sample liquid can be accurately dropped on the test paper through the reserved test port.

[0011] In some exemplary embodiments, a receiving cavity for accommodating the water absorption layer is formed in the cover plate. The cover plate is provided with a pressing groove adapted to the test paper on the inner side of the test port. The cover plate is pressed against the test paper through the pressing groove.

[0012] The above technical solution is realized. Through the pressing groove, a uniform downward pressure can be applied to the four edges of the test paper, so that the test paper and the water absorption layer can be in close contact without adhesive.

[0013] In some exemplary embodiments, the area of the test paper is smaller than the area of the water absorption layer, and the edge of the test paper does not exceed the edge of the water absorption layer.

[0014] In some exemplary embodiments, the test paper is consistent with the central longitudinal axis of the water absorption layer.

[0015] In some exemplary embodiments, the thickness ratio of the test paper to the water absorption layer is 1:1-1:2.

[0016] In some exemplary embodiments, the thickness of the water absorption layer is 1-5 mm.

[0017] In some exemplary embodiments, the test paper and the water-absorbing layer are both square, and the length ratio of the test paper to the water-absorbing layer is 1:5-1:5.5.

[0018] In some exemplary embodiments, the length of the water-absorbing layer is 1-15 cm, and the length of the test paper is 0.2-2 cm.

[0019] The above technical solution is realized, the water-absorbing capacity of the water-absorbing layer and the test paper is optimized by reasonable size ratio, and the excellent test precision is ensured.

[0020] In some exemplary embodiments, the four sides of the test paper are fixed to the bottom plate by the suture line passing through the water-absorbing layer.

[0021] The above technical solution is realized, the test paper and the water-absorbing layer are fixed more stably by the suture line, and the test paper and the water-absorbing layer are combined more closely, so that the sample liquid can pass into the water-absorbing layer more quickly, and the test precision and test effect are further improved.

[0022] In some exemplary embodiments, the bottom plate is provided with an adhesive layer at the bottom of the test module, and the water-absorbing layer and the cover plate are both fixed to the bottom plate by the adhesive layer.

[0023] The above technical solution is realized, and the test module and the bottom plate are fixed.

[0024] In some exemplary embodiments, the indicator is N,N-diethyl-p-phenylenediamine or 3,3',5,5'-tetramethylbenzidine, and the fixing agent is polyvinyl alcohol.

[0025] The second aspect of the present application provides a method for preparing a residual chlorine solid-state test paper, comprising:

[0026] According to the preset process parameters, the corresponding size of the bottom plate, the water-absorbing layer and the test paper are pre-cut;

[0027] The water-absorbing layer is pre-fixed to the predetermined position of the bottom plate, and then the test paper is correspondingly attached to the water-absorbing layer;

[0028] The four sides of the test paper are fixed to the bottom plate by the suture line passing through the water-absorbing layer to form a test paper strip.

[0029] The third aspect of the present application provides a method for preparing a residual chlorine solid-state test paper, comprising:

[0030] The cover plate is obtained by opening a test port on the cover plate raw material and forming a corresponding design size of a containing cavity and a pressure groove by a hot film pressure forming mode.

[0031] The water absorption layer and the test paper are cut according to the preset process parameters and corresponding sizes;

[0032] The plurality of cover plates are arranged in reverse order, the test paper is sequentially placed in each pressing groove, and the water absorption layer is placed in each accommodating chamber;

[0033] The adhesive layer is bonded at each predetermined position on the bottom plate substrate, and the cover plates are simultaneously bonded and fixed to the adhesive layer to form a test paper intermediate piece after the bottom plate substrate is inverted;

[0034] The test paper intermediate piece is cut into a plurality of test paper strips according to a predetermined width size.

[0035] The fourth aspect of the present application provides a residual chlorine detection method, which is realized based on the residual chlorine solid-state test paper according to the first aspect, and includes the following steps:

[0036] A sufficient amount of sample liquid to be tested is continuously added to the test paper at the test module in an amount of 100 μL-25 mL, and the sample liquid is quickly absorbed downward by the water absorption layer to increase the water flow per unit test paper;

[0037] The residual chlorine concentration is determined according to the color development effect of the test paper and the standard color card.

[0038] The above technical solutions are realized, the sample liquid is quickly absorbed from top to bottom by the water absorption layer, thereby increasing the water flow per unit test paper, and accordingly enhancing the color development effect, thereby achieving the purpose of increasing the residual chlorine test precision. The water absorption layer and the test paper are protected by the cover plate to reduce damage and prevent sample liquid from spilling during the test, thereby further improving the test precision.

[0039] The embodiment of the present application provides a residual chlorine solid-state detection test paper, a preparation method and a detection method, wherein the residual chlorine solid-state detection test paper comprises a bottom plate and a test module carried on the bottom plate; wherein the test module comprises a water absorption layer fixed on the bottom plate; and a test paper for dropping sample liquid fixed opposite to the water absorption layer, the test paper is loaded with an indicator and a fixing agent, the color changing degree of the indicator is positively correlated with the concentration of residual chlorine participating in the reaction, and the water absorption capacity of the test paper is lower than that of the water absorption layer. When residual chlorine is detected, the sample liquid to be detected is continuously dropped on the test paper. Since the area and water absorption capacity of the water absorption layer are higher than those of the test paper, the sample liquid moves from top to bottom under the action of the water absorption layer after being dropped on the test paper, so that the water passing amount of unit test paper is increased, the sample liquid continuously reacts with the indicator loaded on the test paper to achieve color development effect, and since the color changing degree of the indicator is positively correlated with the concentration of residual chlorine participating in the reaction, the corresponding residual chlorine concentration can be obtained according to the color development effect. By increasing the water passing amount, the color development effect of the solution under low residual chlorine concentration can be correspondingly enhanced, and the purpose of increasing the residual chlorine test precision is achieved. The water absorption layer and the test paper can be protected by the cover plate to reduce damage and prevent sample liquid from overflowing during the test, so that the test precision can be further improved. BRIEF DESCRIPTION OF DRAWINGS

[0040] Fig. 1 is a top view of the residual chlorine solid-state detection test paper of the embodiment one of the present application;

[0041] Fig. 2 is a structural schematic view of the residual chlorine solid-state detection test paper of the embodiment one of the present application;

[0042] Fig. 3 is a structural schematic view of the residual chlorine solid-state detection test paper of the embodiment two of the present application;

[0043] Fig. 4 is a structural schematic view of the residual chlorine solid-state detection test paper of the embodiment three of the present application;

[0044] Fig. 5 is a flow schematic view of the preparation method of the embodiment six of the present application.

[0045] ILLUSTRATIVE DESCRIPTION:

[0046] Wherein, 10-bottom plate; 20-test module; 21-water absorption layer; 22-test paper; 221-suture line; 23-cover plate; 231-test port; 232-receiving cavity; 233-pressing groove; 30-adhesive layer. DETAILED DESCRIPTION

[0047] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described below, obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative efforts belong to the scope of the present application.

[0048] Embodiment one

[0049] As shown in FIG. 1 and FIG. 2, the first aspect of the embodiments of the present application provides a residual chlorine solid-state test paper, comprising a bottom plate 10 and a test module 20 carried on the bottom plate 10.

[0050] Specifically, the test module 20 comprises a water absorption layer 21 fixed on the bottom plate 10, a test paper 22 fixed opposite to the water absorption layer 21, the test paper 22 being loaded with an indicator and a fixing agent whose oxidized discoloring degree is positively correlated with the concentration of residual chlorine participating in the reaction, and the area of the test paper 22 being smaller than that of the water absorption layer 21 and the water absorption capacity of the test paper 22 being lower than that of the water absorption layer 21, and a cover plate 23 fixed on the bottom plate 10 and pressing the test paper 22 tightly on the water absorption layer 21, the water absorption layer 21 being sealed in the cover plate 23, and the cover plate 23 being provided with a test port 231 for exposing part of the test paper 22 to add sample solution.

[0051] Wherein, a containing cavity 232 for containing the water absorption layer 21 is formed in the cover plate 23, a pressing groove 233 matched with the test paper 22 is provided on the cover plate 23 inside the test port 231, the cover plate 23 is pressed tightly on the test paper 22 through the pressing groove 233, the depth of the pressing groove 233 is slightly smaller than the thickness of the test paper 22, so that a uniform downward pressure can be applied to the four edges of the test paper 22 through the pressing groove 233, so that the test paper 22 can be in close contact with the water absorption layer 21 without adhesive, and the cover plate 23 can be made of plastic or resin and the like, so as to have sufficient waterproof property, accordingly, the bottom plate 10 can also be made of PVC or regenerated resin, and in actual application, the bottom plate 10 and the cover plate 23 are made of the same material.

[0052] In the embodiments, the indicator is N,N-diethyl-p-phenylenediamine (DPD) and the fixing agent is polyvinyl alcohol, so that the indicator will not fall off the paper and will not be displaced with the solution during the test.

[0053] In some embodiments, the indicator can also be 3,3',5,5'-tetramethylbenzidine (TMB).

[0054] Further, the bottom plate 10 is provided with an adhesive layer 30 at the bottom of the test module 20, and the water absorption layer 21 and the cover plate 23 are fixed to the bottom plate 10 through the adhesive layer 30, so as to fix the test module 20 to the bottom plate 10. During processing, the adhesive can be coated on the predetermined position of the bottom plate 10 to form the adhesive layer 30, then the water absorption layer 21 is adhered to the adhesive layer 30, and finally the cover plate 23 is adhered to the adhesive layer 30, and the water absorption layer 21 is located in the accommodation chamber 232 and the test paper 22 is located in the pressing groove 233, so as to complete the installation and fixation of the test module 20.

[0055] In the embodiment, the length of the water absorption layer 21 is 1-15 cm and the thickness is 1-5 mm, and the length of the test paper 22 is 0.2-2 cm, and the length ratio of the test paper 22 to the water absorption layer 21 is 1:5-1:5.5. Through reasonable size ratio, the water absorption capacity of the water absorption layer 21 and the test paper 22 is optimized, so as to ensure the excellent test precision. The water absorption layer 21 can be filter paper.

[0056] The water absorption layer 21, the test paper 22 and the adhesive layer 30 are all square, and the test port 231 is also square. Of course, in other embodiments, it can also be circular or other shapes, and the edge of the test paper 22 does not exceed the edge of the water absorption layer 21. When setting, the center longitudinal axis of the test paper 22 is preferably consistent with that of the water absorption layer 21, and the number of test modules 20 is set to 1 group. In some embodiments, it can also be set to 2-4 groups, so as to be able to perform repeated tests, and at the same time, different indicator concentrations or different size ratios of the water absorption layer 21 to the test paper 22 can be set according to needs, so as to form different detection precision ranges, for example, 0.01-2 ppm (precision 0.02), 0.5-5 ppm (precision 0.5), 1-10 ppm (precision 1).

[0057] When detecting residual chlorine, the sample liquid to be tested is continuously added to the test paper 22 from the test port 231. Since the area and water absorption capacity of the water absorption layer 21 are higher than those of the test paper 22, when the sample liquid is added to the test paper 22, it will quickly move from top to bottom under the action of the water absorption layer 21, so as to increase the water flow per unit test paper 22. The sample liquid continuously reacts with the indicator loaded on the test paper 22 to achieve color development effect. Since the color change degree of the indicator is positively correlated with the concentration of the residual chlorine participating in the reaction, the corresponding residual chlorine concentration can be obtained according to the color development effect. By increasing the water flow, the color development effect of the solution under low residual chlorine concentration can be correspondingly enhanced, so as to achieve the purpose of increasing the residual chlorine test precision. The cover plate 23 can protect the water absorption layer 21 and the test paper 22 to reduce damage and prevent sample liquid from overflowing during the test, so as to further improve the test precision.

[0058] Embodiment two

[0059] The difference between the embodiment and the embodiment one is that, as shown in FIG. 3, in the embodiment, the way of pressing and fixing the test paper 22 and the water absorption layer 21 by the cover plate 23 is replaced by fixing the test paper 22 by the sewing thread 221, specifically, the test paper 22 is fixed to the bottom plate 10 by the sewing thread 221 passing through the water absorption layer 21 around the test paper 22, the sewing thread 221 is preferably cotton thread to facilitate sample liquid transmission, the test paper 22 and the water absorption layer 21 can be fixed more stably by the sewing thread 221, and the test paper 22 and the water absorption layer 21 are combined more closely, so that the sample liquid can pass through the test layer into the water absorption layer 21 more quickly, further improving the test accuracy and test effect. It can be understood that in the embodiment, the water absorption layer 232 can also be pre-stuck to the bottom plate 10 by setting the adhesive layer 30.

[0060] Embodiment three

[0061] The difference between the embodiment and the embodiment one is that, as shown in FIG. 4, in the embodiment, on the basis of setting the cover plate 23, the sewing thread 221 is further set around the test paper 22 to strengthen the fixation of the test paper 22 and the water absorption layer 21 to the bottom plate 10, specifically, the test paper 22 is fixed to the bottom plate 10 by the sewing thread 221 passing through the water absorption layer 21 around the test paper 22, the sewing thread 221 is preferably cotton thread to facilitate sample liquid transmission, the test paper 22 and the water absorption layer 21 can be fixed more stably by the sewing thread 221, and the test paper 22 and the water absorption layer 21 are combined more closely, so that the sample liquid can pass into the water absorption layer 21 more quickly, further improving the test accuracy and test effect.

[0062] In the processing, the adhesive can be coated at the predetermined position of the bottom plate 10 to form the adhesive layer 30, then the water absorption layer 21 is adhered to the adhesive layer 30, then the test paper 22 is fixed to the water absorption layer 21 and the bottom plate 10 by the sewing thread 221, finally the cover plate 23 is adhered to the adhesive layer 30, and the water absorption layer 21 is located in the accommodation chamber 232 and the test paper 22 is located in the pressing groove 233, so as to complete the installation and fixation of the test module 20.

[0063] Embodiment four

[0064] The difference between the embodiment and the embodiment one is that, in the embodiment, the way of pressing and fixing the test paper 22 and the water absorption layer 21 by the cover plate 23 is replaced by the form of adhesive fixation, that is, the adhesive is set at the edge combination of the test paper 22 and the water absorption layer 21 for adhesive fixation, and the water absorption layer 21 and the bottom plate 10 are also adhered and fixed by the adhesive layer 30.

[0065] Embodiment five

[0066] The second aspect of the embodiment of the present application provides a method for preparing the residual chlorine solid-state test paper as described in the embodiment two, comprising:

[0067] S100, the bottom plate 10, the water absorption layer 21 and the test paper 22 are pre-cut according to the preset process parameters.

[0068] Specifically, the size of the bottom plate 10, the water absorption layer 21 and the test paper 22 is designed according to the test accuracy required by the test paper before processing, and is pre-cut for standby through a cutting device. The specific size design is described in the embodiment one, and will not be repeated here.

[0069] S200, the water absorption layer 21 is pre-adhered and fixed to the predetermined position of the bottom plate 10, and then the test paper 22 is correspondingly attached to the water absorption layer 21.

[0070] Specifically, the pre-adhesion of the water absorption layer 21 can be realized by pre-coating an adhesive on the bottom plate 10, or pre-adhering a pre-cut adhesive layer 30 on the bottom plate 10. After removing the release paper or the diaphragm on the adhesive layer 30, the water absorption layer 21 can be pre-adhered and fixed, and the test paper 22 is closely attached to the water absorption layer 21, and the center longitudinal axis of the test paper 22 is substantially coincided with the center longitudinal axis of the water absorption layer 21.

[0071] S300, the test paper 22 is stitched around by the stitching line 221 passing through the water absorption layer 21 to be fixed on the bottom plate 10 to form a test paper strip.

[0072] Specifically, the test paper 22 can be stitched by a stitching device to be fixed on the bottom plate 10 by the stitching line 221 passing through the water absorption layer 21.

[0073] Embodiment six

[0074] The third aspect of the embodiment of the present application provides a method for preparing the residual chlorine solid-state test paper as described in the embodiment one, as shown in FIG. 5, comprising:

[0075] S400, a test port 231 is opened on the cover plate 23 raw material, and a corresponding design size of the accommodation chamber 232 and the pressure groove 233 is obtained by hot film pressing to obtain the cover plate 23.

[0076] Specifically, the cover plate 23 raw material is a square thin plate, the test port 231 is opened at the center position of the cover plate 23 raw material, and then a hot film pressing machine is used for processing, and finally the corresponding cover plate 23 structure is obtained. Of course, in other embodiments, the cover plate 23 can also be formed by injection molding.

[0077] S500, the water absorption layer 21 and the test paper 22 are pre-cut according to the preset process parameters.

[0078] Specifically, the size of the water absorption layer 21 and the test paper 22 is designed according to the test accuracy required by the test paper before processing, and is pre-cut by a cutting device for standby, and the specific size design is described in the embodiment one, which is not repeated here.

[0079] S600, the plurality of cover plates 23 are arranged in order after being placed upside down, the test paper 22 is placed in each pressure groove 233 in turn, and the water absorption layer 21 is placed in each accommodation chamber 232.

[0080] Specifically, the direction of the cover plate 23 placed upside down is that the test port 231 faces downward, and the accommodation chamber 232 faces upward, so as to install the test paper 22 and the water absorption layer 21. The test paper 22 needs to be completely embedded in the pressure groove 233, and the water absorption layer 21 needs to be completely embedded in the accommodation chamber 232. The test paper 22 slightly protrudes from the pressure groove 233 in a natural state after being placed, and the water absorption layer 21 slightly protrudes from the accommodation chamber 232 in a natural state after being placed. Usually, 4-8 cover plates 23 are arranged in a group to form a row for processing.

[0081] S700, the adhesive layer 30 is bonded at each predetermined position on the base plate 10 substrate, and the base plate 10 substrate is inverted to make each cover plate 23 correspondingly bonded and fixed to each adhesive layer 30 to form a test paper intermediate piece.

[0082] Specifically, the size of the adhesive layer 30 is consistent with the outer peripheral size of the cover plate 23, and the bottom surface of the cover plate 23 forms a bonding surface. After the base plate 10 substrate is bonded with the adhesive layer 30, the base plate 10 substrate is inverted to make each adhesive layer 30 correspond to each cover plate 23, and then the base plate 10 substrate is pressed down, so that the cover plate 23 and the adhesive layer 30 are bonded and fixed.

[0083] S800, the test paper intermediate piece is cut into a plurality of test paper strips according to a predetermined width size.

[0084] Specifically, the test paper intermediate piece is cut by a cutting device to cut the base plate 10 substrate into a plurality of base plates 10. The width of the base plate 10 is basically the same as the width size of the cover plate 23. After cutting, the test paper strip is finally obtained.

[0085] Example seven

[0086] The fourth aspect of the embodiment of the application provides a residual chlorine detection method, which is realized based on the residual chlorine solid-state test paper of the first aspect, and includes the following steps:

[0087] S10, take a sufficient amount of sample liquid to be tested at the test port 231 of at least one test module 20, continuously drop 100 μL-25 mL onto the test paper 22, and quickly absorb the sample liquid downward by the water absorption layer 21 to increase the water flow per unit of test paper 22, the amount of sample liquid dropped can be determined according to the size of the residual chlorine solid-state detection test paper.

[0088] S20, judge the residual chlorine concentration according to the color development effect of the test paper 22 against the standard color card, because the degree of oxidation and discoloration is positively correlated with the concentration of residual chlorine participating in the reaction, so the corresponding residual chlorine concentration can be obtained according to the color development effect; in some embodiments, if the base plate 10 is provided with a plurality of test modules 20, the sample liquid can be dropped on the plurality of test modules 20 at the same time to perform a plurality of comparison tests and improve the test accuracy.

[0089] The sample liquid is added by dripping, the water absorption layer 21 quickly absorbs the sample liquid from top to bottom, increasing the water flow per unit of test paper 22, which can increase the amount of indicator oxidized and increase the degree of discoloration, thereby achieving high-precision measurement of low-range residual chlorine concentration, and further achieving the purpose of increasing the precision of residual chlorine testing. The cover plate 23 can protect the water absorption layer 21 and the test paper 22 to reduce damage and prevent sample liquid from spilling during testing, thereby further improving the test accuracy.

[0090] In order to verify the test accuracy of the detection test paper, test examples 1 to 5 are designed, and the specific test data is shown in Table 1:

[0091] Table 1 Test accuracy of detection test paper under different test conditions

[0092] As can be seen from Table 1, the length of the test paper 22 mainly affects the test range, the length of the water absorption layer 21 mainly affects the liquid amount, and the test accuracy is determined by the ratio of the length of the test paper 22 to the length of the water absorption layer 21.

[0093] The above embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as limiting the scope of the patent. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are equivalent modifications and evolution of the above embodiments according to the essential technology of the present application, and these are within the protection scope of the present application.

Claims

1. A solid residual chlorine test strip, characterized in that, The utility model relates to a residual chlorine solid-state test paper, comprising: a base plate and a test module carried on the base plate; wherein the test module comprises: a water-absorbing layer fixed on the base plate; and a test paper for dropping sample liquid fixed opposite to the water-absorbing layer, the test paper being loaded with an indicator and a fixing agent whose oxidized discoloring degree is positively correlated with the concentration of residual chlorine participating in the reaction, and the water-absorbing capacity of the test paper being lower than that of the water-absorbing layer.

2. The solid-state test paper for residual chlorine according to claim 1, characterized by The base plate is fixed with a cover plate for pressing the test paper against the water-absorbing layer, the water-absorbing layer is sealed in the cover plate, and the cover plate is provided with a test port for exposing part of the test paper for dropping sample liquid.

3. The solid-state test paper for residual chlorine according to claim 2, characterized by The cover plate is formed with a containing cavity for containing the water-absorbing layer, the cover plate is provided with a pressing groove adapted to the test paper on the inner side of the test port, and the cover plate is pressed against the test paper through the pressing groove.

4. The solid-state test paper for residual chlorine according to claim 1, wherein The area of the test paper is smaller than that of the water-absorbing layer, and the edge of the test paper does not exceed the edge of the water-absorbing layer.

5. The solid-state test paper for residual chlorine according to claim 4, characterized by The central longitudinal axis of the test paper is consistent with that of the water-absorbing layer.

6. The solid-state test paper for residual chlorine according to claim 4, wherein The thickness ratio of the test paper to the water-absorbing layer is 1:1-1:

2.

7. The solid-state test paper for residual chlorine according to claim 6, wherein The thickness of the water-absorbing layer is 1-5 mm.

8. The solid-state test paper for residual chlorine according to claim 4, wherein The test paper and the water-absorbing layer are both square, and the side length ratio of the test paper to the water-absorbing layer is 1:5-1:5.

5.

9. The solid-state test paper for residual chlorine according to claim 8, wherein The side length of the water-absorbing layer is 1-15 cm, and the side length of the test paper is 0.2-2 cm.

10. The solid-state test paper for residual chlorine according to any one of claims 1 to 3, characterized by, The four sides of the test paper are fixed to the base plate through the suture line passing through the water-absorbing layer.

11. The solid-state test paper for residual chlorine according to claim 2 or 3, characterized by, The bottom of the base plate is provided with an adhesive layer, and the water-absorbing layer and the cover plate are both fixed to the base plate through the adhesive layer.

12. The solid-state test paper for residual chlorine according to claim 1, wherein The indicator uses N, N-diethyl-p-phenylenediamine or 3, 3', 5, 5'-tetramethylbenzidine, and the fixing agent uses polyvinyl alcohol.

13. A method of preparing the residual chlorine solid-state test paper according to claim 10, characterized by, The utility model relates to a residual chlorine solid-state test paper, comprising: a base plate and a test module carried on the base plate; wherein the test module comprises: a water-absorbing layer fixed on the base plate; and a test paper for dropping sample liquid fixed opposite to the water-absorbing layer, the test paper being loaded with an indicator and a fixing agent whose oxidized discoloring degree is positively correlated with the concentration of residual chlorine participating in the reaction, and the water-absorbing capacity of the test paper being lower than that of the water-absorbing layer.

14. A method of preparing the residual chlorine solid-state test paper according to claim 11, characterized by, The base plate is fixed with a cover plate for pressing the test paper against the water-absorbing layer, the water-absorbing layer is sealed in the cover plate, and the cover plate is provided with a test port for exposing part of the test paper for dropping sample liquid. The cover plate is formed with a containing cavity for containing the water-absorbing layer, the cover plate is provided with a pressing groove adapted to the test paper on the inner side of the test port, and the cover plate is pressed against the test paper through the pressing groove. The area of the test paper is smaller than that of the water-absorbing layer, and the edge of the test paper does not exceed the edge of the water-absorbing layer. The central longitudinal axis of the test paper is consistent with that of the water-absorbing layer. The thickness ratio of the test paper to the water-absorbing layer is 1:1-1:

2. The thickness of the water-absorbing layer is 1-5 mm.

15. A method of detecting residual chlorine, characterized by, The test paper and the water-absorbing layer are both square, and the side length ratio of the test paper to the water-absorbing layer is 1:5-1:5.

5. The side length of the water-absorbing layer is 1-15 cm, and the side length of the test paper is 0.2-2 cm. The four sides of the test paper are fixed to the base plate through the suture line passing through the water-absorbing layer. The bottom of the base plate is provided with an adhesive layer, and the water-absorbing layer and the cover plate are both fixed to the base plate through the adhesive layer. The indicator uses N, N-diethyl-p-phenylenediamine or 3, 3', 5, 5'-tetramethylbenzidine, and the fixing agent uses polyvinyl alcohol. The utility model relates to a residual chlorine solid-state test paper, comprising: a base plate and a test module carried on the base plate; wherein the test module comprises: a water-absorbing layer fixed on the base plate; and a test paper for dropping sample liquid fixed opposite to the water-absorbing layer, the test paper being loaded with an indicator and a fixing agent whose oxidized discoloring degree is positively correlated with the concentration of residual chlorine participating in the reaction, and the water-absorbing capacity of the test paper being lower than that of the water-absorbing layer. The base plate is fixed with a cover plate for pressing the test paper against the water-absorbing layer, the water-absorbing layer is sealed in the cover plate, and the cover plate is provided with a test port for exposing part of the test paper for dropping sample liquid. The cover plate is formed with a containing cavity for containing the water-absorbing layer, the cover plate is provided with a pressing groove adapted to the test paper on the inner side of the test port, and the cover plate is pressed against the test paper through the pressing groove. The area of the test paper is smaller than that of the water-absorbing layer, and the edge of the test paper does not exceed the edge of the water-absorbing layer. The central longitudinal axis of the test paper is consistent with that of the water-absorbing layer. The thickness ratio of the test paper to the water-absorbing layer is 1:1-1:

2. The thickness of the water-absorbing layer is 1-5 mm. The test paper and the water-absorbing layer are both square, and the side length ratio of the test paper to the water-absorbing layer is 1:5-1:5.

5. The side length of the water-absorbing layer is 1-15 cm, and the side length of the test paper is 0.2-2 cm. The four sides of the test paper are fixed to the base plate through the suture line passing through the water-absorbing layer. The bottom of the base plate is provided with an adhesive layer, and the water-absorbing layer and the cover plate are both fixed to the base plate through the adhesive layer. The indicator uses N, N-diethyl-p-phenylenediamine or 3, 3', 5, 5'-tetramethylbenzidine, and the fixing agent uses polyvinyl alcohol. According to the color development effect of the test paper, the standard color card is used to judge the residual chlorine concentration.

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