Diffusive gradients in thin films (DGT) test device for lake water and test method using same

Patent metadata

Field	Value
Publication number	US-12169164-B2
Application number	US-202117142495-A
Country	US
Kind code	B2
Filing date	Jan 6, 2021
Priority date	Jan 7, 2020
Publication date	Dec 17, 2024
Grant date	Dec 17, 2024

Abstract

A diffusive gradients in thin films (DGT) test device for lake water, including: a floating ball and a plurality of water sampling units. A DGT detection device, a water quality detection device with a multi-parameter probe, and a water sampling device are disposed in each of the water sampling units. The water sampling device includes: a plurality of sampling bottles, each of the sampling bottles is provided with an inlet pipe and an exhaust pipe, each of the inlet pipes and exhaust pipes is provided with a one-way solenoid valve; a peristaltic pump, a water sample outlet of the peristaltic pump communicates with the inlet pipes of the plurality of sampling bottles via a multi-way connector; the exhaust pipes of the plurality of sampling bottles are connected to an exhaust manifold via a multi-way connector; a control device connected with the peristaltic pump and each of the one-way solenoid valves.

First claim

What is claimed is:

1. A diffusive gradients in thin films (DGT) test device for lake water, comprising:
a floating ball; and
a plurality of water sampling units arranged below the floating ball in sequence along a vertical direction, wherein, every two adjacent water sampling units are connected to each other via a rope, and the topmost water sampling unit is connected to the floating ball also via a rope;
a DGT detection device, a water quality detection device with a multi-parameter probe, and a water sampling device are disposed in each of the water sampling units; and
each water sampling device comprises:
a plurality of sampling bottles, wherein, each of the sampling bottles is provided with an inlet pipe and an exhaust pipe; and each of the inlet pipes and exhaust pipes is provided with a one-way solenoid valve;
a peristaltic pump, wherein, a water sample outlet of the peristaltic pump connected to the inlet pipes of the plurality of sampling bottles via a first multi-way connector; and the exhaust pipes of the plurality of sampling bottles are connected to an exhaust manifold via a second multi-way connector; and
a control device connected to the peristaltic pump and the one-way solenoid valve on each of the inlet pipes and exhaust pipes.

2. The DGT test device for lake water according to claim 1 , wherein, each said water sampling device is provided with an integrated sampler comprising:
a fixing plate, wherein, a power supply and the control device are fixedly mounted on a bottom surface of the fixing plate;
a water pump fixing base located below the fixing plate and fixedly connected to the fixing plate, wherein, the peristaltic pump is mounted on the water pump fixing base;
a solenoid valve and connector fixing ring located below the water pump fixing base and fixedly connected to the water pump fixing base, wherein, a socket is mounted on the solenoid valve and connector fixing ring, and the first multi-way connector, the second multi-way connector and the one-way solenoid valve on each of the inlet on each of the inlet pipes and exhaust pipes are mounted on the socket; and
a sampling bottle fixing ring located below the solenoid valve and connector fixing ring and fixedly connected to the solenoid valve and connector fixing ring, wherein, a corresponding one of the plurality of sampling bottles is mounted below the sampling bottle fixing ring;
wherein, the power supply is connected to the peristaltic pump, the one-way solenoid valves and the control device via wires, separately.

3. The DGT test device for lake water according to claim 2 , wherein, each DGT detection device is provided with a DGT fixing ring, a plurality of placement holes are evenly arranged along a circumferential direction of the DGT fixing ring, and a plurality of DGT probes are respectively mounted in the plurality of placement holes.

4. The DGT test device for lake water according to claim 3 , wherein, each water quality detection device with a multi-parameter probe comprises a base provided with a mounting hole, wherein a detection electrode is fixedly mounted in the mounting hole of the base through an electrode fixing cover, wherein a fixing rod is fixedly mounted below the base, and the base of each water quality detection device with a multi-parameter probe is fixedly mounted above each DGT detection device through the fixing rod, and wherein a probe at the bottom of the detection electrode runs through and extends below the DGT fixing ring of each DGT detection device.

5. The DGT test device for lake water according to claim 4 , wherein, each said integrated sampler is further provided with a data memory, and the data memory is fixedly mounted on the fixing plate of each said integrated sampler and connected to the detection electrode mounted in the mounting hole of the base of each water quality detection device with a multi-parameter probe.

6. The DGT test device for lake water according to claim 5 , wherein, the plurality of sampling bottles comprises four sampling bottles; both the first multi-way connector and the second multi-way connector are a five-way connector; and three water sampling units are provided.

7. The DGT test device for lake water according to claim 6 , wherein, a sealing cylinder is further provided, each said integrated sampler is removably mounted inside the sealing cylinder, and the DGT fixing ring of each DGT detection device is sleeved on an outer wall of the sealing cylinder and located on an upper part of the sealing cylinder.

8. The DGT test device for lake water according to claim 7 , wherein, the exhaust manifold and a suction pipe of the peristaltic pump both run through each DGT detection device and each water quality detection device with a multi-parameter probe and finally reach the base of each water quality detection device with a multi-parameter probe; and an exhaust outlet of the exhaust manifold and a water sample inlet of the suction pipe are both disposed on an upper surface of the base of each water quality detection device with a multi-parameter probe.

9. The DGT test device for lake water according to claim 8 , wherein, a sampler auxiliary frame is further provided, and the water sampling units are removably mounted on the sampler auxiliary frame in an appropriate manner.

10. A test method based on the DGT test device for lake water according to claim 1 , wherein each DGT detection device is provided with DGT pistons mounted in placement holes disposed on the DGT detection device, the test method comprising: (1) placing the DGT test device for lake water in lake water; (2) using the DGT detection devices in the water sampling units at different depths to conduct DGT detection on water at a corresponding depth, and using each water quality detection device with a multi-parameter probe to detect water quality; opening the one-way solenoid valve on the inlet pipe and the one-way solenoid valve on the exhaust pipe of each of the sampling bottles of each water sampling device, and using the control device to control actions of the peristaltic pump, the one-way solenoid valve on the inlet pipe and the one-way solenoid valve on the exhaust pipe so that water is pumped into the sampling bottles of each water sampling device at regular intervals for sampling; and (3) retrieving DGT test device for lake water from the lake, and taking out water samples in the DGT pistons and the sampling bottles for processing and analysis.

11. A test method based on the DGT test device for lake water according to claim 2 , wherein each DOT detection device is provided with DGT pistons mounted in placement holes disclosed on the DGT detection device, the test method comprising: (1) placing the DGT test device for lake water in lake water; (2) using the DGT detection devices in the water sampling units at different depths to conduct DGT detection on water at a corresponding depth, and using each water quality detection device with a multi-parameter probe to detect water quality; opening the one-way solenoid valve on the inlet pipe and the one-way solenoid valve on the exhaust pipe of each of the sampling bottles of each water sampling device, and using the control device to control actions of the peristaltic pump, the one-way solenoid valve on the inlet pipe and the one-way solenoid valve on the exhaust pipe so that water is pumped into the sampling bottles of each water sampling device at regular intervals for sampling; and (3) retrieving DGT test device for lake water from the lake, and taking out water samples in the DGT pistons and the sampling bottles for processing and analysis.

12. A test method based on the DGT test device for lake water according to claim 3 , wher

Assignees

• Chinese Res Acad Env Sciences

Inventors

• Wang Shuhang
• Wu Zhihao
• Jiang Xia
• Zhang Bo
• Wang Kun
• Wang Wenwen
• Chen Junyi
• Zhao Li
• Cai Qing
• Yao Cheng

Classifications

• G01N33/1826 Primary

  Organic contamination in water · CPC title

• G01N1/18

  with provision for splitting samples into portions (G01N1/12, G01N1/14 take precedence; fraction-collection apparatus for chromatography B01D15/08) · CPC title

• G01N2001/1427

  Positive displacement, piston, peristaltic · CPC title

• G01N1/14 Primary

  Suction devices, e.g. pumps; Ejector devices · CPC title

• G01K13/026

  of moving liquids · CPC title