Field water quality field detection method based on sampling depth precorrection

Abstract

The invention discloses a field water quality field detection method based on sampling depth pre-correction, the method uses an anti-interference high-precision water quality detector for detection, and the method comprises the following steps: S1, arranging the detector: floating the detector in a target water area, and connecting the detector with the shore through a cable; s2, acquiring a set depth: calculating the set depth according to the target depth required by detection and the change of the water loading amount in the detection process of the detector, and completing the pre-correction of the sampling depth; s3, releasing the pipeline: releasing the sampling pipeline of the detector according to the set depth obtained in the step S2; s4, cleaning and air-drying: preparing a detection chamber of the distilled water cleaning detector, and air-drying the detection chamber after cleaning; s5, sampling detection: collecting a water sample and completing water quality detection. The sampling depth can be pre-corrected, cleaning and air drying can be completed through self-produced distilled water, detection interference items are avoided from the two aspects of sampling depth errors and residues, it is guaranteed that a detection result truly corresponds to a detection position, and the detection precision is improved.

Description

Technical Field

[0001] The present invention relates to the field of inspection and detection technology, and in particular to a field water quality detection method based on sampling depth pre-correction. Background Art

[0002] Water quality testing is divided into on-site testing and laboratory testing after sampling. During on-site testing, water samples from multiple points need to be tested. The residual water samples from the previous test in the water quality testing instrument will interfere with the next test and affect the accuracy of the test.

[0003] Ensuring that the detector is clean and dry before testing is a link that is easily overlooked in the testing work.

[0004] In addition, due to the weight gain of water samples, the floating water quality detector easily causes the sampling depth to be inconsistent with the target depth, resulting in the test results not corresponding to the actual sampling depth. No corresponding solutions are provided in the literature for the above technical defects. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a field water quality on-site detection method based on sampling depth pre-correction, which can pre-correct the sampling depth and use self-produced distilled water to complete cleaning and air-drying, avoid detection interference items from two aspects: sampling depth error and residue, ensure that the detection results are truly corresponding to the detection position and improve the detection accuracy.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: a field water quality on-site detection method based on sampling depth pre-correction, the method uses an anti-interference high-precision water quality detector for detection, including the following steps:

[0007] S1. Arrange the detector: float the detector in the target waters and connect it to the shore via a cable;

[0008] S2. Obtaining the set depth: Calculate the set depth according to the target depth required for detection and the change in the amount of water loaded during the detection process of the detector, and complete the pre-calibration of the sampling depth;

[0009] S3, release pipeline: release the sampling pipeline of the detector according to the set depth obtained in step S2;

[0010] S4, cleaning and air drying: preparing distilled water to clean the detection chamber of the detector, and air drying the detection chamber after cleaning;

[0011] S5. Sampling and testing: Collect water samples and complete water quality testing.

[0012] As a preferred technical solution of the present invention, the anti-interference high-precision water quality detector used includes a float, a detection platform is fixedly installed on the upper surface of the float, the detection platform is equipped with a working room, the working room is provided with a detection room, a water sample collection system and an anti-interference system, and the anti-interference system includes a distilled water generator and an air dryer.

[0013] As a preferred technical solution of the present invention, the studio is in the shape of a quadrangular pyramid surrounded by solar panels, and the solar panels are connected to batteries.

[0014] As a preferred technical solution of the present invention, a water quality detection module is provided in the detection chamber, an air dryer is installed on the top of the detection chamber, and a water inlet and a drain are provided on the side wall of the detection chamber; the water sample collection system includes a sampling pipeline, a sampling pump installed on the sampling pipeline, and a wire spooler; the distilled water generator, the sampling pipeline and the detection chamber are intersected at a two-inlet and two-outlet valve through a pipeline, the two-inlet and two-outlet valve is provided with a drain pipe, the end of the drain pipe is connected to a gravity compensation chamber, the gravity compensation chamber is provided with a drain valve, and the water supply per unit time of the sampling pump is the same as the drainage per unit time of the drain valve.

[0015] As a preferred technical solution of the present invention, the distilled water generator and the sampling pipeline are respectively connected to the two inlets of the two-inlet and two-outlet valve, the detection chamber and the exhaust pipe are respectively connected to the two outlets of the two-inlet and two-outlet valve, and a flow meter is set at each interface position of the pipeline.

[0016] As a preferred technical solution of the present invention, an electric valve and a ball cage are installed at the lower end of the sampling pipeline.

[0017] As a preferred technical solution of the present invention, the distilled water generator includes an evaporation pool, a distilled water collection pool arranged on the top of the evaporation pool, and a condensation top arranged on the top of the distilled water collection pool. The condensation top is provided with a heat exchange interlayer, and the heat exchange interlayer is connected to a cold water pump and a cold water pipeline; the evaporation pool is connected to a water supply pump and a water supply pipeline, and an electric heating module is provided in the evaporation pool.

[0018] As a preferred technical solution of the present invention, the water inlet and the water outlet in the heat exchange interlayer are located at the bottom and the top respectively.

[0019] As a preferred technical solution of the present invention, the condensation top is conical, a confluence groove is arranged on the inner wall of the condensation top, the distilled water collection pool is located outside the side wall of the evaporation pool, and the bottom of the condensation top is connected to the outer wall of the distilled water collection pool.

[0020] As a preferred technical solution of the present invention, the water quality detection module includes a dissolved oxygen sensor, a pH sensor, a turbidity sensor and a heavy metal detector.

[0021] The beneficial effects of the above technical solution are: the present invention can not only pre-correct the sampling depth to avoid sampling depth errors caused by changes in the amount of water loaded in the detector, but also convert the water at the detection site into distilled water through a distilled water generator for flushing the detector, and use an air dryer to air dry the detection room to avoid interference of the residues of the previous detection on the next detection, improve the detection accuracy, and avoid the breeding of bacteria in the detection room. The studio can not only use solar energy to generate electricity, but also provide light shielding, wind protection, and rain protection for detection, avoiding the influence of sunlight, wind, and rain on water samples and detection instruments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] Figure 1 It is a work flow chart of the present invention.

[0024] Figure 2 A schematic diagram of the longitudinal structure of the detector of the present invention.

[0025] In the figure: 1, float 2, test bench 3, workroom 4, test room 5, solar panel 6, battery 7, water quality test module 8, air dryer 9, sampling pipeline 10, sampling pump 11, cable arranging device 12, two-inlet and two-outlet valve 13, drain pipe 14, electric valve 15, ball cage 16, evaporation tank 17, distilled water collection tank 18, condensation top 19, heat exchange interlayer 20, cold water pump 21, cold water pipeline 22, water supply pump 23, water supply pipeline 24, electric heating module 25, water outlet 26, confluence trough 27, gravity compensation chamber. DETAILED DESCRIPTION

[0026] See also Figure 2 The structure of the anti-interference high-precision water quality detector used in the present invention includes a float 1, a detection platform 2 is fixedly installed on the upper surface of the float 1, a studio 3 is mounted on the detection platform 2, a detection room 4, a water sample collection system and an anti-interference system are arranged in the studio 3, and the anti-interference system includes a distilled water generator and an air dryer 8. The distilled water generator can use the water body on site to make distilled water for flushing the detection room 4, and the air dryer 8 can air dry the distilled water in the detection room 4 to provide a clean and dry detection environment for the next detection.

[0027] The studio 3 is in the shape of a quadrangular pyramid surrounded by a solar panel 5, and the solar panel 5 is connected to a battery 6. The solar panel 5 includes four isosceles trapezoids and one square. The studio 3 can not only generate electricity using solar energy to provide electrical energy for the electrical components of the detector, but also provide a relatively independent and closed detection environment for shading, wind and rain protection for the detection area.

[0028] The detection chamber 4 is provided with a water quality detection module 7, an air dryer 8 is installed on the top of the detection chamber 4, and a water inlet and a drain are provided on the side wall of the detection chamber 4; the water sample collection system includes a sampling pipeline 9, a sampling pump 10 installed on the sampling pipeline 9, and a cable 11; the distilled water generator, the sampling pipeline 9, and the detection chamber 4 are intersected at a two-in-two-out valve 12 through a pipeline, and the two-in-two-out valve 12 is provided with an emptying pipe 13, and the end of the emptying pipe 13 is connected to a gravity compensation chamber 27, and the gravity compensation chamber 27 is provided with a drain valve, and the water supply per unit time of the sampling pump is the same as the drainage per unit time of the drain valve. The two-in-two-out valve 12 is used to switch the connection relationship between the distilled water generator, the sampling pipeline 9, the gravity compensation chamber 27, and the detection chamber 4.

[0029] The distilled water generator and the sampling pipeline 9 are respectively connected to the two inlets of the two-inlet and two-outlet valve 12, the detection chamber 4 and the exhaust pipe 13 are respectively connected to the two outlets of the two-inlet and two-outlet valve 12, and a flow meter is set at each interface position of the pipeline.

[0030] The lower end of the sampling pipeline 9 is equipped with an electric valve 14 and a ball cage 15. The electric valve 14 is used to control the opening and closing of the sampling pipeline 9, and the ball cage 15 has the function of counterweight and filtering large volume debris in the water. A liquid level meter is added in the ball cage 15 to detect the water sampling depth.

[0031] The distilled water generator includes an evaporation pool 16, a distilled water collection pool 17 arranged on the top of the evaporation pool 16, and a condensation top 18 arranged on the top of the distilled water collection pool 17. The condensation top 18 is provided with a heat exchange interlayer 19, and the heat exchange interlayer 19 is connected to a cold water pump 20 and a cold water pipeline 21; the evaporation pool 16 is connected to a water supply pump 22 and a water supply pipeline 23, and an electric heating module 24 is arranged in the evaporation pool 22. The water inlet and the water outlet 25 in the heat exchange interlayer 19 are located at the bottom and the top respectively. The condensation top 18 is conical, and a confluence groove 26 is arranged on the inner wall of the condensation top 18. The distilled water collection pool 17 is located on the outer side of the side wall of the evaporation pool 16, and the bottom of the condensation top 18 is connected to the outer wall of the distilled water collection pool 17. The water supply pump 22 injects water into the evaporation pool 16, and the electric heating module 24 heats the water in the evaporation pool 16 to generate water vapor. The water vapor rises to the condensation top 18 and liquefies into distilled water droplets on the inner surface of the condensation top 18. The confluence trough 26 can gather the distilled water droplets into a flow, which eventually flows into the distilled water collection pool 17. Cold water is injected into the heat exchange interlayer 19 and the flow is maintained from bottom to top, so that the condensation top 18 maintains a low temperature and ensures the condensation conditions.

[0032] The water quality detection module 7 includes a dissolved oxygen sensor, a pH sensor, a turbidity sensor and a heavy metal detector.

[0033] Combination Figure 1 and 2,The detection method and working principle of the present invention are as follows: the detector floats on the target water body through a float 1 and is connected to the shore through a cable.

[0034] The cable arranging device 11 needs to release the sampling pipeline 9 to the target depth under water. The specific parameter for executing the release is the set depth. In view of the influence of the weight of the water in the distilled water generator and the water sample in the detection chamber 4 during operation, the depth of the part of the float 1 submerged below the water surface changes, so the set depth (set by the release length of the sampling pipeline 9 or the liquid level sensor) is not equal to the target depth to be sampled. Therefore, the set depth needs to be corrected to ensure that the water sample at the target depth can be collected. The correction method is:

[0035] Where: D is the set depth, D1 is the target depth, V1 is the volume of water injected into the distilled water generator, V2 is the volume of the water sample in the detection chamber, V3 is the volume of distilled water used to clean the detection chamber, g is the acceleration of gravity, and S is the cross-sectional area of ​​the float 1. The cross-sectional area of ​​the float 1 remains consistent from top to bottom.

[0036] According to the set depth calculated by the above correction method, the sampling pipeline 9 is released, and the two-in-two-outlet valve 12 connects the water sample collection system and the drain pipe 13. In the early stage, as the amount of water loaded on the float 1 increases, the float 1 gradually sinks. The water sample collected in this process is water between the set depth and the target depth, so it cannot enter the detection chamber 4 for detection. When the water volume in the gravity compensation chamber 27 reaches the target sampling water volume, the drain valve is opened. Because the water supply per unit time of the sampling pump is the same as the drainage volume per unit time of the drain valve, the water volume in the gravity compensation chamber 27 remains constant. At this time, the water sample collected is the water sample of the target depth; according to the sampling pump The pumping speed and the volume of the sampling pipeline can obtain the time for the target depth water sample in the sampling pipeline to completely replace the non-target depth water sample, and then the two-inlet and two-outlet valve 12 connects the water sample collection system and the detection chamber 4 and closes the passage to the emptying pipe 3. The water injection speed of the detection chamber 4 is the same as the drainage speed of the gravity compensation chamber 27, so the amount of water loaded by the float 1 is not inconvenient, and the total gravity remains constant, so that the water sample of the target depth can be continuously collected. The water sample of the target depth is injected into the detection chamber 4. When the target sampling water volume is reached, the sampling pump 10 stops working, and the gravity compensation chamber 27 is emptied at the same time; finally, the water sample in the detection chamber 4 is tested.

[0037] In addition, the distilled water generator is used to make distilled water. After the last test is completed, the two-inlet and two-outlet valve 12 connects the distilled water collection pool 17 of the distilled water generator with the test chamber 4 to clean the test chamber 4;

[0038] After the detection chamber 4 is rinsed, the air dryer 8 air-dries the detection chamber 4 to make the detection chamber 4 clean and dry, so as to prepare for the next detection without interference.

[0039] Follow the above steps to perform multiple cycles of testing. After all are completed, retract the detector via the cable.

[0040] The above description is only proposed as an implementable technical solution of the present invention, and is not intended to be a single limitation on the technical solution itself.

Claims

1. A field water quality detection method based on sampling depth pre-correction, which uses an anti-interference high-precision water quality detector for detection, characterized in that: The following steps are involved: S1. Arrange the detector: float the detector in the target waters and connect it to the shore via a cable; S2. Obtaining the set depth: Calculate the set depth according to the target depth required for detection and the change in the amount of water loaded during the detection process of the detector, and complete the pre-calibration of the sampling depth; S3, release pipeline: release the sampling pipeline of the detector according to the set depth obtained in step S2; S4, cleaning and air drying: preparing distilled water to clean the detection chamber of the detector, and air drying the detection chamber after cleaning; S5. Sampling and testing: Collect water samples and complete water quality testing.

2. The detection method according to claim 1, characterized in that: The structure of the anti-interference high-precision water quality detector includes a float and a detection platform on the float, the detection platform is provided with a studio that can provide light shielding, wind protection, rain protection, power generation and a closed detection environment for the detection area, the studio is provided with a detection room, a water sample collection system and an anti-interference system, and the anti-interference system includes a distilled water generator and an air dryer; The studio is in the shape of a quadrangular pyramid surrounded by solar panels. The solar panels are connected to batteries. The solar panels 5 include four isosceles trapezoids and one square.

3. The detection method according to claim 2, characterized in that: The detection chamber is provided with a water quality detection module, the air dryer is installed on the outer shell of the detection chamber, and the side wall of the detection chamber is provided with a water inlet and a drain; The water sample collection system includes a sampling pipeline, a sampling pump and a line distributor; The distilled water generator, sampling pipeline and detection room are connected at a two-in-two-out valve through pipelines. The two-in-two-out valve is provided with an emptying pipe, the end of the emptying pipe is connected to a gravity compensation chamber, and the gravity compensation chamber is provided with a drain valve. The water supply per unit time of the sampling pump is the same as the water discharge per unit time of the drain valve; The distilled water generator and the sampling pipeline are respectively connected to the two inlets of the two-inlet and two-outlet valve, the detection chamber and the exhaust pipe are respectively connected to the two outlets of the two-inlet and two-outlet valve, and a flow meter is arranged at each interface position of the pipeline.

4. The detection method according to claim 3, characterized in that: The pre-correction calculation method of step S2 is: Where: D is the set depth, which is set by the release length of the sampling pipeline or the liquid level sensor, D1 is the actual target depth to be sampled, V1 is the volume of the injected water in the distilled water generator, V2 is the volume of the water sample in the detection chamber, V3 is the volume of the distilled water used to clean the detection chamber, and S is the cross-sectional area of ​​the float; the cross-sectional area of ​​the float remains consistent from top to bottom.

5. The detection method according to claim 4, characterized in that: The sampling and detection process of step S5 is as follows: S5-1, the sampling pipeline reaches the target sampling depth: the two-inlet and two-outlet valves connect the water sample collection system and the drain pipe, and when the water volume in the gravity compensation chamber reaches the target sampling water volume, the drain valve is opened, and the water volume in the gravity compensation chamber is kept constant. At this time, the water sample collected is the water sample of the target depth; S5-2, water sample replacement: according to the pumping speed of the sampling pump and the volume of the sampling pipeline, the time for the target depth water sample in the sampling pipeline to completely replace the non-target depth water sample can be obtained. According to the calculated time, the water sample in the sampling pipeline is completely replaced with the water sample of the target depth; S5-3, chamber conversion, complete sampling: the two-in-two-out valve connects the water sample collection system and the detection chamber and closes the passage to the drain pipe. The water filling speed of the detection chamber is the same as the drainage speed of the gravity compensation chamber, so the amount of water loaded by the float remains unchanged, the total gravity remains constant, and the water sample of the target depth can be continuously collected. The water sample of the target depth is injected into the detection chamber. When the target sampling water volume is reached, the sampling pump stops working, and the gravity compensation chamber is emptied at the same time, completing the sampling; S5-4. Complete the test: Finally, test the water sample in the test room.

6. The detection method according to claim 3, characterized in that: An electric valve and a ball cage are installed at the lower end of the sampling pipeline, and the weight of the electric valve and the ball cage can make the sampling pipeline straighten and droop naturally.

7. The detection method according to claim 1, characterized in that: The distilled water generator for preparing distilled water in step S4 includes an evaporation pool, a distilled water collection pool sealed and sleeved on the top of the evaporation pool, and a condensation top with a sealing cover arranged on the top of the distilled water collection pool. A heat exchange interlayer is arranged on the outer wall of the condensation top, and the heat exchange interlayer is connected to a cold water pump and a cold water pipeline; the evaporation pool is connected to a water supply pump and a water supply pipeline, and an electric heating module is arranged in the evaporation pool, and the electric heating module is connected to a battery.

8. The detection method according to claim 7, characterized in that: The water inlet and the water outlet in the heat exchange interlayer are located at the bottom and the top respectively.

9. The detection method according to claim 7 or 8, characterized in that: The condensation top is conical, a confluence groove is arranged on the inner wall of the condensation top, the distilled water collection pool is annular and located outside the side wall of the evaporation pool, and the bottom of the condensation top is connected to the outer wall of the distilled water collection pool.

10. The detection method according to claim 3, characterized in that: The water quality detection module includes a dissolved oxygen sensor, a pH sensor, a turbidity sensor and a heavy metal detector.

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