CN211528139U

CN211528139U - PO-DGT combined detection device for sediment nutrients

Info

Publication number: CN211528139U
Application number: CN201922330927.2U
Authority: CN
Inventors: 丁士明; 任明漪; 王燕
Original assignee: Nanjing Zhigan Environmental Technology Co ltd; Nanjing Guoxing Environmental Protection Industry Research Institute Co ltd
Current assignee: Nanjing Zhigan Environmental Technology Co ltd; Nanjing Guoxing Environmental Protection Industry Research Institute Co ltd
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2020-09-18
Anticipated expiration: 2029-12-23

Abstract

The utility model discloses a sediment nutrient PO-DGT allies oneself with detection device, including transparent box, PO-DGT composite sensor, the reinforcement light source and the camera that are used for the light filling that are used for splendid attire the sediment sample, PO-DGT composite sensor includes superimposed PVDF filter membrane, fixed adsorption film and plane light polar film in proper order, PO-DGT composite sensor is attached at the inner wall of transparent box, and makes the plane light polar film outwards, and PVDF filter membrane contact deposit; the camera of the camera is over against the plane optical pole film, and the reinforcing light source is arranged near the plane optical pole film. The utility model discloses can be to the high-efficient collection analysis of nutrient substance synchronous distribution information in the water deposit.

Description

PO-DGT combined detection device for sediment nutrients

Technical Field

The utility model belongs to the technical field of nutrient element's enrichment and collection analysis among the environment medium, especially, relate to the collection of nitrogen, phosphorus element in the water deposit.

Background

At present, active phosphorus and nitrogen in water sediments are generally determined in an active mode, namely, the sediments are taken out of the water and then sent back to a laboratory for analysis. Because the sediments are in a reducing environment under the natural conditions of the water body, the sediments are easy to change after being taken out, and analysis errors are caused. The currently developed passive sampling analysis mode thin film diffusion gradient technology DGT can be used for placing a fixed gel thin film capable of absorbing elements such as phosphorus, nitrogen, sulfur, heavy metals and the like in an in-situ deposit for enrichment, and then taking out the fixed gel thin film for analysis, thereby indirectly obtaining the information of the elements such as active nitrogen, phosphorus, sulfur, heavy metals and the like in the deposit. However, the existing fixed gel film can only selectively adsorb a single element, so that the analysis and determination efficiency is low, and in-situ synchronous enrichment detection cannot be realized; and simultaneously due to the fact that. In addition, NO exists due to nitrogen element in natural environment₃-N and NH₄The adsorption rate of the existing direct adsorption gel is too consistent and poor, and the adsorption rate is not enough.

Disclosure of Invention

The purpose of the invention is as follows: to the problem and not enough of above-mentioned existing existence, the utility model aims at providing a sediment nutrient PO-DGT allies oneself with uses detection device, can be to the high-efficient collection analysis of nutrient substance synchronous distribution information in the water body deposit.

The technical scheme is as follows: in order to achieve the purpose, the utility model adopts the following technical scheme: a PO-DGT combined detection device for sediment nutrients comprises a transparent box for containing sediment samples, a PO-DGT composite sensor, a reinforcing light source for supplementing light and a camera, wherein the PO-DGT composite sensor comprises a PVDF filter membrane, a fixed adsorption membrane and a planar photoelectrode membrane which are sequentially overlapped; the camera of the camera is over against the plane optical pole film, and the reinforcing light source is arranged near the plane optical pole film.

Preferably, the sampling device further comprises a transparent water tank for containing sampling water on the upper layer of the water body, at least one transparent box is immersed in the transparent water tank, the sampling water on the upper layer of the water body is enabled to submerge the transparent box, and one side, provided with the PO-DGT composite sensor, of the transparent box is close to the inner wall of the transparent water tank.

Preferably, the side plate of the transparent box on the side provided with the PO-DGT composite sensor is a detachable side plate.

Preferably, 3 transparent boxes for containing sediment samples are arranged in the transparent water tank.

Preferably, the PO-DGT composite sensor is arranged to be partially in contact with the sediment and partially in contact with the water on the sediment.

Has the advantages that: compared with the prior art, the utility model discloses a synchronous collection analysis of nitrogen/phosphorus in the water body deposit, the collection-extraction reduction analysis rate of accuracy of nutrient element N/P in the deposit can reach 95.6% respectively.

Drawings

FIG. 1 is a schematic structural diagram of a PO-DGT combined detection device for sediment nutrients.

The device comprises a PVDF filter membrane 1, a fixed adsorption membrane 2, a planar optical pole membrane 3 and a side wall 4.

Detailed Description

The present invention will be further clarified by the following description with reference to the attached drawings and specific examples, which should be understood as being merely illustrative of the present invention and not limiting the scope of the present invention, and modifications of various equivalent forms of the present invention by those skilled in the art after reading the present invention, all fall within the scope defined by the appended claims of the present application.

As shown in figure 1, the utility model discloses PO-DGT to nutrient substance synchronous distribution information in water body sediment allies oneself with collection system, sediment nutrient thing PO-DGT allies oneself with detection device, including the transparent box that is used for splendid attire deposit thing sample, PO-DGT composite sensor, be used for the reinforcement light source and the camera of light filling, PO-DGT composite sensor includes superimposed PVDF filter membrane, fixed adsorption film and plane light polar film in proper order, PO-DGT composite sensor is attached at the inner wall of transparent box, and makes the plane light polar film outwards, and PVDF filter membrane contact deposit; the camera of the camera is over against the plane optical pole film, and the reinforcing light source is arranged near the plane optical pole film. In order to ensure the consistency of multi-group detection and ensure that the overlying water of sediments can be kept stable during aerobic culture, a transparent water tank is arranged and is filled with filtered lake water to be overlaid with water, then three transparent boxes for parallel test are immersed into the transparent water tank, the upper layer of sampled water of a water body is enabled to be submerged for 45cm above the transparent boxes, and one side of each transparent box provided with a PO-DGT composite sensor is close to the inner wall of the transparent water tank, so that a camera can conveniently and clearly take pictures.

6 sediment column samples (9 cm diameter, 40cm length) and overburden water were collected from the Meilianwan in the northern part of Taihu lake and transported to the laboratory as soon as possible within 24 hours. The sediment was sliced to depth at 2 cm intervals and the sediment of the same depth was mixed well and large particles were sieved from the sediment using a 0.6mm mesh screen. Then the sediment is stacked in a transparent organic glass box in sequence according to the original depth of the sediment, the transparent organic glass box is then placed in a water tank filled with water in a target water area (three groups of tests can be arranged), and 45 cm-deep filtered lake water is ensured to be arranged above the sediment. Then after 2 weeks of culture under aerobic conditions, the PO-DGT combined sensor is attached to the inner wall of a transparent organic glass box, and the PVDF filter membrane is in contact with the sediment to be detected, while O₂And the sensing film is attached to the inner wall of the transparent organic glass box, the camera is used for photographing every 8 hours, and the PO-DGT combined sensor is taken out after 24 hours. Processing the photo to generate two-dimensional O₂A distribution diagram; the PO-DGT combined sensor is extracted by 0.001M NaCl and 1.0M NaOH to obtain NO₃-N,NH₄-N and PO₄-flux of P, F ═ M/At, as follows: firstly, the fixed adsorption film is immersed into 20ml of 1.0M NaCl for 24 hours to extract NO₃-N and NH₄N, then the adsorption membrane is immersed in 20ml of 1.0M NaOH for 24 hours to extract PO₄P, calculating the extraction quantity.

Claims

1. A sediment nutrient PO-DGT combined detection device is characterized in that: the PO-DGT composite sensor comprises a transparent box for containing sediment samples, a PO-DGT composite sensor, a reinforcing light source for supplementing light and a camera, wherein the PO-DGT composite sensor comprises a PVDF filter membrane, a fixed adsorption membrane and a planar optical pole membrane which are sequentially overlapped; the camera of the camera is over against the plane optical pole film, and the reinforcing light source is arranged near the plane optical pole film.

2. The PO-DGT combined detection device for sediment nutrients as claimed in claim 1, wherein: the sampling device also comprises a transparent water tank for containing sampling water on the upper layer of the water body, at least one transparent box is immersed in the transparent water tank, the sampling water on the upper layer of the water body is enabled to submerge the transparent box, and one side of the transparent box, which is provided with the PO-DGT composite sensor, is close to the inner wall of the transparent water tank.

3. The PO-DGT combined detection device for sediment nutrients as claimed in claim 1, wherein: the side plate on one side of the transparent box provided with the PO-DGT composite sensor is a detachable side plate.

4. The PO-DGT combined detection device for sediment nutrients as claimed in claim 2, wherein: and 3 transparent boxes for containing sediment samples are arranged in the transparent water tank.

5. The PO-DGT combined detection device for sediment nutrients as claimed in claim 2, wherein: the PO-DGT composite sensor adopts a setting that part of the PO-DGT composite sensor is in contact with sediment and part of the PO-DGT composite sensor is in contact with water on the upper layer of the sediment.