Device for detecting chloride ions in building sand
By designing a chloride ion detection device for multiple sets of titration sample chambers for building sand and a sample chamber to be tested, the problem of low detection efficiency of titration for building sand is solved, and a rapid preliminary judgment of the chloride ion concentration range is achieved, and the detection rate and efficiency are improved.
Patent Information
- Application Number
- CN202421070530.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-16
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-05-16
AI Technical Summary
During the titration and detection of construction sand, the titration rate needs to be slowed down to determine the concentration of chloride ions in the volumetric flask, resulting in insufficiency of detection.
A chloride ion detection device for building sand is designed, including multiple sets of titrated sample chambers and sample chambers to be tested with the same volume. By adding a standard concentration of silver nitrate solution and observing the color change, the concentration range of chloride ions is initially judged, thereby improving the detection efficiency.
Through this device, the concentration range of chloride ions can be quickly judged, the detection rate and efficiency of chloride ions detection in building sand can be improved, and the estimation error of experimental personnel can be reduced.
Smart Images
Figure CN222926690U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of titration detection, in particular to a device for detecting chloride ions in construction sand. Background Technique
[0002] According to the formulation of construction industry standards, the standard of GB 175—2007 "Common Portland Cement" was officially implemented on June 1, 2008. The regulation that the chloride ion content must be ≤0.06% was added to the standard. Since then, the building materials industry has paid more attention to the detection of chloride ions.
[0003] As is well known, chloride ions in sand will affect the service life of building materials in the building materials, and will accelerate the corrosion of building materials such as steel bars in an environment with excessive chloride ions. Finding a more convenient detection method is more conducive to improving the standardized management of building materials. Since then, the building materials industry has paid more attention to the detection of chloride ions.
[0004] Currently, for the detection of chloride ions, it is mainly detected by titration, and the silver nitrate titration method is used for titration testing. Among them, using the principle of stepwise reaction with K 2 CrO 4 as an indicator, titrating CI 3 with AgNO - standard solution, and the reaction therein is: Ag + +CI - →AgCl↓(milky white precipitate) The reaction of the indicator K 2 CrO 4 with AgNO 3 is: 2Ag + +CrO 4 2- →Ag 2 CrO 4 ↓(brick red precipitate).
[0005] Since the solubility of Ag 2 CrO 4 precipitate is greater than that of AgCl, so Ag + first reacts with CI - to form a milky white precipitate of AgCl, and then reacts with CrO 4 2- to form Ag 2 CrO 4 brick red precipitate. When the titration solution is brick red, it indicates the end point of the titration.
[0006] However, during the titration process of construction sand, the chloride ions in the volumetric flask containing construction sand are unknown. During the titration process using a burette, it is necessary to slow down the titration speed to determine the color-changing range in the volumetric flask. Therefore, in the actual operation process, the experimenter will estimate the chloride ions in the volumetric flask, and then judge how many milliliters of standard-concentration silver nitrate are needed in the burette, which will reduce the detection efficiency of chloride ions in construction sand. Summary of the Invention
[0007] This application provides a device for detecting chloride ions in construction sand, which is used to roughly estimate the concentration of chloride ions in construction sand, thereby improving the detection efficiency of chloride ions in construction sand.
[0008] A device for detecting chloride ions in construction sand provided by this application includes a detection housing, and at least two groups of titration sample components, a sample to be tested component, and a blank sample component arranged in the detection housing; the titration sample component includes a titration sample chamber formed by the detection housing for accommodating a titration reagent; the sample to be tested component includes a sample to be tested chamber formed by the detection housing for accommodating a sample solution of construction sand to be tested; the blank sample component includes a blank sample paper arranged on the detection housing; the titration sample chamber communicates with the sample to be tested chamber.
[0009] By adopting the above technical solution, a standard-concentration silver nitrate solution (titration reagent) is added to multiple groups of titration sample chambers with the same volume, and a sample solution of construction sand to be tested is added to the sample to be tested chamber; the standard-concentration silver nitrate solution in the titration sample chamber is sequentially added to the sample to be tested chamber, and then the color change in the titration sample chamber is observed. By judging in which group of titration sample chambers the standard-concentration silver nitrate solution causes the color of the solution in the sample to be tested chamber to change, the range of chloride ion concentration can be preliminarily judged. When using a burette for titration, the standard-concentration silver nitrate solution can be directly titrated below the range of chloride ion concentration, and then the concentration change can be observed by titrating drop by drop, thereby obtaining an accurate titration concentration; during the titration process of the chloride ion detection device, a standard titration sample chamber is determined, which is a certain determined group. When the previous combinations all cause the color in the titration sample chamber to change, it can be judged that the chloride ion concentration has exceeded the standard range, and the titration experiment can be stopped. The chloride ions in this group of construction sand can be directly judged to exceed the standard concentration. Both can improve the detection rate of chloride ions in construction sand, make a preliminary qualitative and quantitative judgment in advance, judge the titration range of chloride ions, and then conduct quantitative analysis through titration, thereby improving the detection efficiency of the laboratory.
[0010] Optionally, a switch component for opening or closing the titration sample chamber is arranged on the titration sample component.
[0011] By adopting the above technical solution, the setting of the switch component enables the standard silver nitrate in the titration sample component to be opened sequentially for titration, thereby estimating the chloride ion concentration of the construction sand.
[0012] Optionally, the chamber volumes of the respective titration sample chambers are the same.
[0013] Optionally, a first connection hole is provided on the titration sample component, and the first connection hole communicates with the titration sample chamber.
[0014] Optionally, a first cover for closing the titration sample chamber is provided on the titration sample component.
[0015] By adopting the above technical solution, on the one hand, the first cover can close the titration sample chamber, reduce the entry of impurities, and improve the accuracy of estimating the chloride ion concentration of the construction sand; on the other hand, when the switch component is opened, the first cover needs to be opened to make the internal and external pressures consistent, so that the standard silver nitrate solution can flow into the test sample chamber.
[0016] Optionally, a second connection hole is provided on the chamber wall of the test sample chamber of the test sample component; both ends of the second connection hole communicate with the test sample chamber and the outside; a second cover for closing the test sample chamber is provided on the test sample component at the second connection hole.
[0017] By adopting the above technical solution, the second connection hole provided on the chamber wall of the test sample chamber of the test sample component is a channel for adding the test construction sand sample solution, and then the second cover is used to close the test sample chamber, thereby improving the accuracy of estimating the chloride ion concentration of the construction sand
[0018] Optionally, a card slot for fixing the blank sample paper is provided on the blank sample component.
[0019] Optionally, the chamber wall of the detection housing where the titration sample chamber is located is made of non-transparent light-shielding material.
[0020] Optionally, the chamber wall of the detection housing where the test sample chamber is located is made of transparent material.
[0021] By adopting the above technical solution, since a part of the nitrate ions in the silver nitrate solution in the titration sample chamber exist in the form of nitric acid molecules, when irradiated by light, the nitrate ions will decrease, resulting in the combination of silver ions and hydroxide ions, and finally silver oxide is formed, causing the solution to deteriorate; in the test sample chamber, since the change in color in the test sample chamber needs to be observed at all times, the result of the titration can be observed through the transparent material.
[0022] Optionally, scale lines are provided on the sample component to be tested.
[0023] One or more technical solutions provided in this application have at least the following technical effects or advantages:
[0024] 1. In this application, standard concentration silver nitrate solution (titration reagent) is added to multiple titration sample chambers with the same volume, and the sample solution of the building sand to be tested is added to the sample chamber to be tested; the standard concentration silver nitrate solution in the titration sample chamber is successively added to the sample chamber to be tested, and then the color change in the titration sample chamber is observed to judge the titration range of chloride ions, and then quantitative analysis is carried out through titration, thereby improving the detection efficiency of the laboratory.
[0025] 2. In this application, the titration sample chamber is sealed with a first cover to reduce the entry of impurities and improve the accuracy of estimating the chloride ion concentration in the building sand; the first cover can also be opened to make the internal and external pressures consistent, so that the standard silver nitrate solution can flow into the sample chamber to be tested.
[0026] 3. In this application, the chamber wall of the titration sample chamber is made of non-transparent light-shielding material, and the chamber wall of the sample chamber to be tested is made of transparent material; the deterioration of the silver nitrate solution in the titration sample chamber is reduced to improve the accuracy of estimating the chloride ion concentration in the building sand; the color change in the sample chamber to be tested can be observed at all times in the sample chamber to be tested to view the final titration result. Description of the Drawings
[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0028] Figure 1 It is a schematic diagram of the overall structure of the device for detecting chloride ions in building sand in the embodiment of this application;
[0029] Figure 2 It is an exploded structure diagram of the device for detecting chloride ions in building sand in the embodiment of this application;
[0030] Figure 3 It is a schematic diagram of the overall structure of the device for detecting chloride ions in building sand in the embodiment of this application;
[0031] Figure 4 It is a cross-sectional view of the device for detecting chloride ions in building sand in the embodiment of this application.
[0032] Description of reference numerals: 1. Detection housing; 2. Titration sample assembly; 21. Titration sample chamber; 22. Switch assembly; 23. First connection hole; 24. First cover; 3. Test sample assembly; 31. Test sample chamber; 32. Second connection hole; 33. Second cover; 4. Blank sample assembly; 41. Blank sample paper; 42. Card slot. Detailed implementation manners
[0033] The present application provides a device for detecting chloride ions in construction sand, which is used to roughly estimate the concentration of chloride ions in construction sand, thereby improving the detection efficiency of chloride ions in construction sand.
[0034] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.
[0035] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned accompanying drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or server including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or modules not clearly listed or inherent to these processes, methods, products or devices.
[0036] Referring to Figure 1 , a device for detecting chloride ions in construction sand according to this embodiment includes a detection housing 1, and at least two groups of titration sample assemblies 2, test sample assemblies 3 and blank sample assemblies 4 arranged in the detection housing 1.
[0037] Specifically, six groups of titration sample assemblies 2 are provided in the present application, and each group of titration sample assemblies 2 includes a titration sample chamber 21 formed by the detection housing 1 for accommodating a titration reagent. The titration reagent in the embodiment of the present application is a silver nitrate solution with a standard concentration.
[0038] In addition, the test sample assembly 3 includes a test sample chamber 31 formed by the detection housing 1 for accommodating a test construction sand sample solution. Among them, the test construction sand sample solution is a solution prepared from construction sand and added with potassium chromate as an indicator.
[0039] The blank sample assembly 4 includes a blank sample paper 41 provided on the detection housing 1, and the titration result is judged by comparing the colors of the blank sample paper 41; moreover, the titration sample chamber 21 and the sample chamber 31 to be tested communicate with each other.
[0040] Refer to Figure 2 , a switch assembly 22 for opening or closing the titration sample chamber 21 is provided on the titration sample assembly 2, so that the standard silver nitrate in the titration sample assembly 2 can be opened sequentially for titration, thereby estimating the chloride ion concentration of the construction sand. In the embodiment of the present application, the switch assembly 22 is rotated to realize the communication between the titration sample chamber 21 and the sample chamber 31 to be tested.
[0041] In addition, refer to Figure 2 and Figure 4 , a first connection hole 23 is opened on the titration sample assembly 2, and the first connection hole 23 communicates with the titration sample chamber 21. The standard silver nitrate solution can be added into the titration sample chamber 21 through the first connection hole 23.
[0042] Moreover, a first cover 24 for closing the titration sample chamber 21 is provided on the titration sample assembly 2. The first cover 24 and the hole wall of the first connection hole 23 are provided with fine lines, thereby improving the tightness of the connection between the two. In addition, on the one hand, the first cover 24 can close the titration sample chamber 21, reduce the entry of impurities, and improve the accuracy of estimating the chloride ion concentration of the construction sand. On the other hand, when the switch assembly 22 is opened, the first cover 24 needs to be opened so that the internal and external pressures are the same, so that the standard silver nitrate solution can flow into the sample chamber 31 to be tested.
[0043] Refer to Figure 3 and refer to Figure 4 , a second connection hole 32 is opened on the wall of the sample chamber 31 to be tested of the sample assembly 3 to be tested. Moreover, both ends of the second connection hole 32 communicate with the sample chamber 31 to be tested and the outside. The sample solution of the construction sand to be tested is added through the second connection hole 32. When performing a preliminary titration, potassium chromate can also be added through the second connection hole 32 as an indicator for titration. In addition, a second cover 33 for closing the sample chamber 31 to be tested is provided at the second connection hole 32 of the sample assembly 3 to be tested, and the sample chamber 31 to be tested is closed through the second cover 33, thereby improving the accuracy of estimating the chloride ion concentration of the construction sand.
[0044] In addition, the cavity wall of the detection housing 1 located in the titration sample chamber 21 is made of a non-transparent light-shielding material. This is because a part of the nitrate ions in the silver nitrate solution in the titration sample chamber 21 exist in the form of nitric acid molecules. When irradiated by light, the nitrate acid ions will decrease, causing silver ions to combine with hydroxide ions, and finally silver oxide is formed, resulting in the deterioration of the solution. By using a non-transparent light-shielding material in this application, the deterioration of silver nitrate can be reduced, and the accuracy of judging the titration range of chloride ions can be improved. In addition, the cavity wall of the detection housing 1 located in the test sample chamber 31 is made of a transparent material, and the change in color in the test sample chamber 31 can be observed at all times through the transparent material to observe the titration result. In addition, scale lines are provided on the test sample assembly 3, which can judge whether the building sand sample solution is over-prepared when adding the building sand sample solution.
[0045] Refer to Figure 2 , a clamping groove 42 for fixing the blank sample paper 41 is provided on the blank sample assembly 4, and the blank sample paper 41 is used as a color reference to judge the titration result.
[0046] The implementation principle of a chloride ion detection device for building sand in this application is as follows: First, standard concentration silver nitrate solution (titration reagent, generally [c(AgNO 3 ) = 0.02 mol / L -1 is added to multiple groups of titration sample chambers 21 with the same volume. By accurately weighing AgNO 3 dried at 105°C, dissolving it in distilled water and making up the volume to 1 L, calibrating with a sodium chloride standard solution, and shaking well and storing it in a brown bottle); Second, the prepared test building sand sample solution and K 2 CrO 4 indicator [ρ(K 2 CrO 4 ) = 50 g / L -1 are added to the test sample chamber 31, and then the standard concentration silver nitrate solution in the titration sample chamber 21 is added to the test sample chamber 31 in sequence; Finally, after each addition of the standard concentration silver nitrate solution in a group of titration sample chambers 21, it is necessary to observe the color change and comparison in the titration sample chamber 21 until the color in the test sample chamber 31 appears brick red, indicating that the titration is complete.
[0047] In this application, the estimation of the rough concentration of chloride ions in building sand is divided into two cases.
[0048] First, it is judged that by determining in which group of titration sample chambers 21 the standard concentration silver nitrate solution causes the color of the solution in the test sample chamber 31 to change, the range of chloride ion concentration can be preliminarily judged. For example, after adding the standard silver nitrate solution in the fourth group of titration sample chambers 21, the color in the test sample chamber 31 appears brick red; and assuming that the volume of the standard concentration silver nitrate solution added to each group of titration sample chambers 21 is 20 ml, it can be judged that the standard concentration silver nitrate solution is completely titrated between 60 - 80 ml. When using a burette for titration, when the standard concentration silver nitrate solution in the burette is directly poured into the volumetric flask containing the solution of the building sand sample to be tested to 60 ml, then start to titrate drop by drop and observe the concentration change to obtain the accurate titration concentration.
[0049] Second, during the titration process of the chloride ion detection device, for example, when determining the fifth standard titration sample chamber 21 as the standard determination group, assuming that the volume of the standard concentration silver nitrate solution added to each group of titration sample chambers 21 is 20 ml. After adding the standard silver nitrate solution in the fifth group of standard titration sample chambers 21, the color in the titration sample chamber 21 does not change. Then it can be judged that the chloride ion concentration in the building sand has exceeded the standard range, and there is no need to conduct a titration experiment. The chloride ions in this group of building sand can be directly judged to exceed the standard concentration.
[0050] Both can improve the detection rate of chloride ions in building sand. First, make a preliminary qualitative and quantitative judgment, determine the titration range of chloride ions, and then conduct quantitative analysis through titration, thereby improving the detection efficiency of the laboratory. It should be noted that the above sequence of embodiments of the present application is only for description and does not represent the superiority or inferiority of the embodiments. And the above description of specific embodiments of this specification is given. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be executed in a different order from that in the embodiments and still achieve the desired results. Additionally, the processes depicted in the drawings do not necessarily require the specific order or sequential order shown to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.
[0051] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
[0052] This specification and the accompanying drawings are merely illustrative of the present application and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of the present application. Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the present application and its equivalent technologies, the present application is intended to include these changes and modifications therein.
Claims
1. A device for detecting chloride ions in building sand, characterized in that: It comprises a detection housing (1), and at least two groups of titration sample assemblies (2), a sample assembly to be tested (3), and a blank sample assembly (4) arranged in the detection housing (1); The titration sample assembly (2) comprises a titration sample chamber (21) formed by the detection housing (1) and used for accommodating a titration reagent; The sample assembly (3) to be tested comprises a sample cavity (31) to be tested formed by the detection housing (1) and used for containing a sample solution of building sand to be tested; The blank sample assembly (4) comprises a blank sample paper (41) arranged on the detection housing (1); The titration sample chamber (21) and the sample chamber to be tested (31) are communicated with each other.
2. The device for detecting chloride ions in construction sand according to claim 1, characterized in that: The titration sample component (2) is provided with a switch component (22) for opening or closing the titration sample chamber (21).
3. The device for detecting chloride ions in construction sand according to claim 2, characterized in that: The chamber volumes of the titration sample chambers (21) of each group are the same.
4. The device for detecting chloride ions in construction sand according to claim 3, characterized in that: The titration sample assembly (2) is provided with a first connection hole (23), and the first connection hole (23) is communicated with the titration sample chamber (21).
5. The device for detecting chloride ions in construction sand according to claim 4, characterized in that: The titration sample assembly (2) is provided with a first sealing cover (24) for sealing the titration sample chamber (21).
6. The device for detecting chloride ions in construction sand according to claim 1, characterized in that: The test sample assembly (3) is located in the wall of the test sample cavity (31) and is provided with a second connection hole (32); both ends of the second connection hole (32) are connected to the test sample cavity (31) and the outside world; The sample assembly (3) to be tested is provided with a second cover (33) at the second connecting hole (32) for sealing the sample cavity (31) to be tested.
7. The device for detecting chloride ions in construction sand according to claim 1, characterized in that: The blank sample assembly (4) is provided with a card slot (42) for fixing the blank sample paper (41).
8. The device for detecting chloride ions in construction sand according to claim 1, characterized in that: The cavity wall of the detection housing (1) located in the titration sample cavity (21) is made of non-transparent light-shielding material.
9. The device for detecting chloride ions in construction sand according to claim 1, characterized in that: The cavity wall of the detection housing (1) located in the sample cavity (31) to be tested is made of transparent material.
10. The device for detecting chloride ions in construction sand according to claim 9, characterized in that: The sample component to be tested (3) is provided with scale lines.