Portable water chlorophyll on-site suction filtration sampling device and sampling method

Abstract

The invention provides a portable water chlorophyll on-site suction filtration sampling device and method. The sampling device comprises a sampling box body, a water suction pump, a sampling filter cup and an air suction pump, a water storage cavity is formed in the sampling box body, a water sampling pipe is connected to the sampling box body, the sampling filter cup is connected with the water storage cavity, and a filter membrane is adhered to the inner wall of the sampling filter cup. The sampling device has the beneficial effects that the water suction pump of the sampling device can quantitatively pump a water body at a specified depth into the water storage cavity, and the air suction pump can pump out air in the water drainage pipe connected with the lower end of the sampling filter cup, so that water in the water body in the sampling filter cup and the water storage cavity is promoted to penetrate through the filter membrane; the chlorophyll in the water sample is blocked and adsorbed on the filter membrane in the sampling filter cup, so that the volume of the chlorophyll sample in the water body can be greatly reduced, and the field sampling difficulty and sampling cost of the chlorophyll sample in the water body are reduced; and the chlorophyll sample is adsorbed on the filter membrane, so that the chlorophyll sample is convenient to store and transport.

Description

Technical Field

[0001] The invention relates to the technical field of sampling, and in particular to a portable on-site filtration sampling device and a sampling method for chlorophyll in water. Background Art

[0002] Chlorophyll a is a very common indicator in surface water quality testing. The determination of chlorophyll a content is crucial to understanding the degree of pollution and environmental conditions of water bodies. According to the national standard HJ 897-2017, the chlorophyll a determination method usually requires the collection of water samples at different depths in the water body through a water sampler. One operation process usually requires the collection of multiple water samples (generally the number of water samples needs to be more than 40). After the water samples are collected, they are quickly transported to the laboratory for analysis under refrigerated conditions. When the chlorophyll concentration in the water body is low, the volume of a single sample needs to be around 500 ml to 1000 ml. The collection and transportation of these samples is not only time-consuming and labor-intensive, but the chlorophyll may also be inactivated during the transfer process, which will greatly reduce the accuracy of the determination of the chlorophyll a content. And when a large number of samples are required, the difficulty and cost of handling and transporting the samples will be greatly increased. Summary of the invention

[0003] In view of this, the difficulty and cost of chlorophyll sampling in surface water bodies should be reduced, and the measurement accuracy of chlorophyll a content in surface water bodies should be improved.

[0004] The present invention provides a portable on-site filtration sampling device for water chlorophyll, comprising a sampling box, a water pump, a sampling filter cup and an air pump; The sampling box is provided with a water storage cavity, the sampling box is connected with a water sampling pipe, the sampling box is provided with a drainage pipe, the water sampling pipe is connected with the water storage cavity, and the water pump is arranged on the water sampling pipe; The sampling filter cup is arranged below the water storage cavity, the upper end of the sampling filter cup is detachably connected to the water storage cavity via a water outlet pipe, and the lower end of the sampling filter cup is connected to the drain pipe. A filter membrane is attached to the inner wall of the sampling filter cup, and the filter membrane can block the chlorophyll in the water body and allow water molecules to flow through, thereby collecting the chlorophyll in the water body; The middle part of the drain pipe is connected to the vacuum pump, and the vacuum pump is used to provide a negative pressure environment for the drain pipe to force the sample in the sampling filter cup to pass through the filter membrane. The lower end of the drain pipe extends out of the sampling box.

[0005] Furthermore, a water sampling head is provided at the end of the water sampling pipe, and the water sampling head includes an upper connecting plate, a lower connecting plate and a plurality of connecting columns, the upper and lower ends of the connecting columns are respectively connected to the upper connecting plate and the lower connecting plate, and the connecting columns are wrapped with a blocking net.

[0006] Furthermore, a counterweight block is provided at the bottom of the lower connecting plate of the water sampling head.

[0007] Furthermore, it also includes a controller. The water sampling pipe is also provided with a flow meter and a solenoid valve. The controller is arranged in the sampling box. The controller is connected to the flow meter, the solenoid valve and the water pump. The controller obtains the flow rate of water pumped into the water storage chamber according to the flow meter, and controls the solenoid valve and the water pump to close after the water pumping flow rate reaches a predetermined value.

[0008] Furthermore, a transparent observation window is inlaid on the side wall of the water storage chamber, and a water volume scale line is also arranged on the transparent observation window.

[0009] Furthermore, the water sampling pipe is also provided with a depth scale line, and the depth scale line is used to mark the water entry depth of the water sampling head.

[0010] Furthermore, the water outlet pipe is located below the water storage chamber, a connecting plate is provided at the lower end of the water outlet pipe, a locking plate is provided at the top of the sampling filter cup, the connecting plate and the locking plate are aligned with each other, and the edges of the connecting plate and the locking plate are fastened and fixed by fastening bolts.

[0011] Furthermore, the top of the drain pipe is open, a mounting groove is provided on the shell at the top of the drain pipe, a water outlet is provided at the bottom of the sampling filter cup, the water outlet can be slidably limited in the mounting groove, and the water outlet is directly opposite to the top opening end of the drain pipe.

[0012] Furthermore, a three-way joint is provided in the middle of the drainage pipe, a suction pipe is provided on the suction pump, the suction pipe is connected to the three-way joint, a one-way valve is provided at the lower end of the drainage pipe, the one-way valve is located below the three-way joint, and a water-blocking and breathable membrane is provided in the suction pipe.

[0013] The present invention also provides a method for on-site filtration sampling of chlorophyll in water, which uses the above-mentioned portable on-site filtration sampling device for chlorophyll in water, and comprises the following steps: S1: Extend the end of the water sampling pipe into the designated water area at a designated depth; S2: Turn on the water pump to quantitatively pump water at a specified depth in a specified water area into the sampling filter cup; S3: Turn on the vacuum pump to extract the air in the drain pipe, so that the drain pipe is in a negative pressure state, so that the water in the sampling filter cup is discharged from the drain pipe, and the chlorophyll in the water in the sampling filter cup is blocked and attached to the filter membrane in the sampling filter cup; S4: Remove the sampling filter cup, separate the filter membrane on the inner wall of the sampling filter cup, remove it and store it, and replace it with a new filter membrane.

[0014] The beneficial effects of the portable on-site filtration sampling device and method for chlorophyll in water bodies of the present invention are as follows: the sampling device comprises a sampling box, a water pump, a sampling filter cup and an air pump; a water storage chamber is provided in the sampling box, a water sampling pipe is connected to the sampling box, the end of the water sampling pipe can be extended to a specified depth, the water pump can quantitatively pump water of the specified depth into the water storage chamber, the sampling filter cup is connected to the water storage chamber, a filter membrane is attached to the inner wall of the sampling filter cup, the air pump can extract the gas in the drain pipe connected to the lower end of the sampling filter cup, and promote the water in the sampling filter cup and the water storage chamber to pass through the filter membrane, so that the chlorophyll in the water sample is blocked and adsorbed on the filter membrane in the sampling filter cup, which can greatly reduce the volume of the chlorophyll sample in the water body, thereby improving the field sampling efficiency of the chlorophyll sample in the water body and reducing the sampling cost. In addition, the chlorophyll sample is adsorbed on the filter membrane, which makes it easier to store and transport the chlorophyll sample, greatly reducing the possibility of chlorophyll inactivation during the transfer process, thereby improving the accuracy of the determination of chlorophyll a content in surface water. This sampling method can greatly reduce the difficulty of chlorophyll sampling in surface water. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention is a schematic diagram of the overall structure of a portable on-site filtration sampling device for water chlorophyll.

[0016] Figure 2 It is a schematic diagram of the internal structure of a portable on-site filtration sampling device for water chlorophyll according to an embodiment of the present invention.

[0017] Figure 3 It is a cross-sectional view of a sampling filter cup of a portable on-site filtration sampling device for chlorophyll in water according to an embodiment of the present invention.

[0018] In the above figure: 1-sampling box, 11-water storage chamber, 12-transparent observation window, 13-connecting plate, 2-water sampling pipe, 21-flow meter, 22-solenoid valve, 3-water sampling head, 31-upper connecting plate, 32-lower connecting plate, 33-blocking net, 34-counterweight, 4-controller, 5-water pump, 6-air pump, 61-air suction pipe, 7-sampling filter cup, 71-locking plate, 72-fastening bolt, 8-drain pipe, 81-tee joint, 82-check valve, 9-filter membrane. DETAILED DESCRIPTION

[0019] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0020] Please refer to Figures 1 to 3 The portable on-site filtration sampling device for chlorophyll in water of the present invention comprises a sampling box 1, a water pump 5, a sampling filter cup 7 and an air pump 6.

[0021] The sampling box 1 is provided with a plurality of partitions, which separate a water storage chamber 11 in the rectangular box. The sampling box 1 is connected with a water sampling pipe 2, and the sampling box is provided with a drainage pipe 8, wherein the water sampling pipe 2 is connected to the water storage chamber 11. The water pump 5 is arranged on the water sampling pipe 2, and the water pump 5 is fixed to the top of the sampling box 1. The end of the water sampling pipe 2 away from the sampling box 1 is also provided with a water sampling head 3. The water sampling head 3 is used to extend into a specified depth in the water body.

[0022] The edge of the sampling box 1 is also provided with a mounting notch, the sampling filter cup 7 is arranged in the mounting notch, and the sampling filter cup 7 is located below the water storage chamber 11, the upper end of the sampling filter cup 7 is detachably connected to the water storage chamber through a water outlet pipe, the lower end of the sampling filter cup 7 is connected to the drain pipe, and the sampling filter cup 7 is in communication with the water storage chamber 11. A filter membrane 9 is attached to the inner wall of the sampling filter cup 7, and a microporous structure with a pore size of about 0.7 microns is distributed in the filter membrane 9. The filter membrane 9 with this pore size can block the chlorophyll in the water body and allow water molecules to flow through, so that the filter membrane 9 can collect the chlorophyll in the water body. The middle part of the drain pipe 8 is connected to the vacuum pump 6 , and the vacuum pump 6 is used to provide a negative pressure environment for the drain pipe 8 , so as to force the water in the sampling filter cup 7 to pass through the filter membrane 9 . The lower end of the drain pipe 8 extends out of the sampling box 1 .

[0023] The suction filtration sampling device can use the water pump 5 and the water sampling pipe 2 to pump a certain amount of water from a specified depth of a specified water body into the water storage chamber 11 and the sampling filter cup 7, wherein the air pump 6 can cause the water in the sampling filter cup to pass through the filter membrane 9, so that the chlorophyll in the water in the water storage chamber 11 and the sampling filter cup 7 is filtered and extracted onto the filter membrane 9, completing the on-site extraction of chlorophyll samples, avoiding the problem of needing to transport a large amount of water samples, thereby reducing the difficulty and cost of subsequent transportation of chlorophyll samples, and reducing the possibility of chlorophyll inactivation during the transfer process, thereby improving the measurement accuracy of chlorophyll a content in surface water bodies.

[0024] Preferably, a water sampling head 3 is provided at the end of the water sampling pipe 2, and the water sampling head includes an upper connecting plate 31, a lower connecting plate 32 and a plurality of connecting columns, the upper and lower ends of the connecting columns are respectively connected to the upper connecting plate 31 and the lower connecting plate 32, and the connecting columns are wrapped with a blocking net 33. A counterweight block 34 is also provided at the bottom of the lower connecting plate of the water sampling head 3. A depth scale line is also provided on the water sampling pipe 2, and the depth scale line is used to mark the depth of the water sampling head 3 entering the water. The blocking net 33 is used to filter large suspended matter and pollutants in the water body; the counterweight block 34 can increase the weight of the water sampling head 3 so that the water sampling pipe 2 can maintain a vertical state during the water sampling process, and the depth scale line can help the staff to judge the depth of the water sampling head 3 entering the water, thereby ensuring that the end of the water sampling pipe 2 extends to the specified depth and completes the fixed-depth sampling of the water body.

[0025] Preferably, a transparent observation window 12 is inlaid on the side wall of the water storage chamber 11. The transparent observation window 12 is made of colored transparent glass, and a water volume scale is also provided on the transparent observation window 12. The water volume scale is used to mark the total water volume in the sampling filter cup 7 and the water storage chamber 11 (that is, the water volume scale marks the water volume extracted by the water pump 5 during each sampling). The transparent observation window 12 allows the staff to observe the water intake to ensure accurate quantitative water intake. The transparent observation window 12 is colored glass to reduce the exposure of sunlight to the sampled water and prevent the chlorophyll in the sampled water from being decomposed under light.

[0026] Preferably, the sampling device also includes a controller 4, which is located in the sampling box 1. A flow meter 21 and a solenoid valve 22 are also provided on the water sampling pipe. The controller 4 is connected to the flow meter 21, the solenoid valve 22, the water pump 5 and the air pump 6. The controller 4 obtains the flow rate of water pumped into the water storage chamber 11 by the water pump 5 according to the flow meter 21, and controls the solenoid valve 22 and the water pump 5 to close after the water pumping flow rate reaches a predetermined value. The controller 4 can accurately control the water intake and can control the switch of the air pump 6 to reduce the difficulty of operation for the staff.

[0027] Preferably, the water outlet pipe is located below the water storage chamber 11, a connection plate 13 is provided at the lower end of the water outlet pipe, a locking plate 71 is provided at the top of the sampling filter cup 7, the connection plate 13 and the locking plate 71 are aligned with each other, and the edges of the connection plate 13 and the locking plate 71 are locked and fixed by fastening bolts 72. The top of the drain pipe is open, a mounting groove is provided on the shell at the top of the drain pipe 8, a water outlet is provided at the bottom of the sampling filter cup 7, the water outlet can be slidably limited in the mounting groove, and the water outlet is directly opposite to the top open end of the drain pipe. This structure allows the sampling filter cup 7 to be quickly installed and disassembled, which is convenient for the staff to collect the filter membrane 9 adsorbed with chlorophyll and replace the new filter membrane 9 at the same time, so that the chlorophyll sampling process can be carried out quickly and continuously.

[0028] Preferably, a three-way joint 81 is provided in the middle of the drain pipe 8, and an exhaust pipe 61 is provided on the air pump 6, and the exhaust pipe 61 is connected to the three-way joint 81. A one-way valve 82 is also provided at the lower end of the drain pipe 8, and the one-way valve 82 is located below the three-way joint 81. A water-blocking and breathable membrane is also provided in the exhaust pipe 61, and the water-blocking and breathable membrane is used to prevent water in the drain pipe 8 from being sucked into the air pump 6 to ensure that the air pump 6 can be used normally. The one-way valve 82 allows water to flow downward and prevents outside air from entering the exhaust pipe 61, thereby ensuring that the drain pipe 8 can maintain a negative pressure state under the action of the air pump 6, and at the same time enables the drain pipe to discharge water flowing out of the sampling filter cup 7.

[0029] The present invention also provides a method for on-site filtration sampling of chlorophyll in water, which uses the above-mentioned portable on-site filtration sampling device for chlorophyll in water, and comprises the following steps: S1: Extend the water intake head at the end of the water sampling pipe 2 into the designated water area, and judge the water depth of the water intake head by the depth scale line on the water sampling pipe 2 until the water intake head reaches the designated depth; S2: Turn on the water pump 5 to quantitatively pump water at a specified depth in a specified water area into the sampling filter cup 7 and the water storage chamber 11; S3: Turn on the vacuum pump 6 to extract the air in the drain pipe 8, so that the drain pipe 8 is in a negative pressure state, so that the water in the sampling filter cup is discharged from the drain pipe 8, and the chlorophyll in the water in the sampling filter cup 7 is blocked and attached to the filter membrane 9 in the sampling filter cup; until the water in the sampling filter cup 7 and the water storage chamber 11 is completely discharged; During the above process, the vacuum pump 6 works intermittently. When the vacuum pump 6 pumps air, the water in the sampling filter cup flows to the drain pipe 8 under negative pressure. When the vacuum pump 6 stops pumping air, the water in the drain pipe 8 flows out of the drain pipe 8 along the one-way valve 82, thereby preventing water accumulation in the drain pipe 8.

[0030] S4: Remove the sampling filter cup, separate and take out the filter membrane 9 on the inner wall of the sampling filter cup 7, store it in a refrigerator, and replace it with a new filter membrane 9.

[0031] By repeating the above process, the collection of chloroplasts in multiple water samples can be quickly completed. This method can greatly reduce the difficulty of chlorophyll sampling in surface water bodies and improve the efficiency of chlorophyll sampling in surface water bodies.

[0032] In this document, the directional words such as front, back, top, and bottom are defined by the positions of the components in the drawings and the positions of the components relative to each other, and are only for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of the directional words should not limit the scope of protection claimed in this application.

[0033] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A portable on-site filtration sampling device for water chlorophyll, characterized in that: It includes a sampling box, a water pump, a sampling filter cup and an air pump; The sampling box is provided with a water storage cavity, the sampling box is connected with a water sampling pipe, the sampling box is provided with a drainage pipe, the water sampling pipe is connected with the water storage cavity, and the water pump is arranged on the water sampling pipe; The sampling filter cup is arranged below the water storage cavity, the upper end of the sampling filter cup is detachably connected to the water storage cavity through a water outlet pipe, and the lower end of the sampling filter cup is connected to the drain pipe. A filter membrane is attached to the inner wall of the sampling filter cup, and the filter membrane can block the chlorophyll in the water body and allow water molecules to flow through, thereby collecting the chlorophyll in the water body; The middle part of the drain pipe is connected to the vacuum pump, and the vacuum pump is used to provide a negative pressure environment for the drain pipe to force the water in the sampling filter cup to pass through the filter membrane. The lower end of the drain pipe extends out of the sampling box.

2. A portable water chlorophyll on-site filtration sampling device according to claim 1, characterized in that: A water sampling head is provided at the end of the water sampling pipe, and the water sampling head includes an upper connecting plate, a lower connecting plate and a plurality of connecting columns. The upper and lower ends of the connecting columns are respectively connected to the upper connecting plate and the lower connecting plate, and the connecting columns are wrapped with a blocking net.

3. A portable water chlorophyll on-site filtration sampling device according to claim 2, characterized in that: A counterweight block is also provided at the bottom of the lower connecting plate of the water sampling head.

4. A portable water chlorophyll on-site filtration sampling device according to claim 1, characterized in that: It also includes a controller. A flow meter and a solenoid valve are also provided on the water sampling pipe. The controller is arranged in the sampling box. The controller is connected to the flow meter, the solenoid valve and the water pump. The controller obtains the flow rate of water pumped into the water storage chamber according to the flow meter, and controls the solenoid valve and the water pump to close after the water pumping flow rate reaches a predetermined value.

5. A portable water chlorophyll on-site filtration sampling device according to claim 1, characterized in that: A transparent observation window is inlaid on the side wall of the water storage cavity, and a water volume scale line is also arranged on the transparent observation window.

6. A portable water chlorophyll on-site filtration sampling device according to claim 2, characterized in that: The water sampling pipe is also provided with a depth scale line, and the depth scale line is used to mark the depth of the water sampling head entering the water.

7. A portable water chlorophyll on-site filtration sampling device according to claim 1, characterized in that: The water outlet pipe is located below the water storage chamber, a connecting plate is provided at the lower end of the water outlet pipe, a locking plate is provided at the top of the sampling filter cup, the connecting plate and the locking plate are aligned with each other, and the edges of the connecting plate and the locking plate are locked and fixed by fastening bolts.

8. A portable water chlorophyll on-site filtration sampling device according to claim 7, characterized in that: The top of the drain pipe is open, a mounting groove is provided on the shell at the top of the drain pipe, a water outlet is provided at the bottom of the sampling filter cup, the water outlet can be slidably limited in the mounting groove, and the water outlet is directly opposite to the top opening end of the drain pipe.

9. The portable on-site filtration sampling device for chlorophyll in water according to claim 1, characterized in that: A three-way joint is provided in the middle of the drainage pipe, a suction pipe is provided on the suction pump, the suction pipe is connected to the three-way joint, a one-way valve is provided at the lower end of the drainage pipe, the one-way valve is located below the three-way joint, and a water-blocking and breathable membrane is provided in the suction pipe.

10. A method for on-site filtration sampling of chlorophyll in water, characterized in that: The method uses the portable water chlorophyll on-site filtration sampling device according to any one of claims 1 to 9, and the method comprises the following steps: S1: Extend the end of the water sampling pipe into the designated depth of the designated water area; S2: Turn on the water pump to quantitatively pump water at a specified depth in a specified water area into the sampling filter cup and the water storage chamber; S3: Turn on the vacuum pump to extract the air in the drain pipe, so that the drain pipe is in a negative pressure state, so that the water in the sampling filter cup is discharged from the drain pipe, and the chlorophyll in the water in the sampling filter cup is blocked and attached to the filter membrane in the sampling filter cup; S4: Remove the sampling filter cup, separate the filter membrane on the inner wall of the sampling filter cup, remove it and store it, and replace it with a new filter membrane.

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