PO-DGT combined detection device for sediment nutrients and collection and detection method

Abstract

The invention discloses a PO-DGT combined detection device for sediment nutrients and a collection and detection method. The device comprises a transparent box for containing a sediment sample, 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 PO-DGT composite sensor is attached to the inner wall of the transparent box, the planar photoelectrode membrane faces outwards, and the PVDF filter membrane is in contact with sediments; a camera head of the camera is right opposite to the planar photoelectrode membrane, and the reinforcing light source is arranged near the planar photoelectrode membrane; and a fixed adsorption film in the PO-DGT composite sensor takes agarose as a base, a NO3-N adsorption material and an NH4-N adsorption material are loaded, Zr-oxide powder is doped, and N-P distribution information in water sediments can be synchronously collected, detected and analyzed.

Description

technical field [0001] The invention belongs to the technical field of enrichment, collection and analysis of nutrient elements in environmental media, and in particular relates to the collection of nitrogen and phosphorus elements in water body sediments. Background technique [0002] At present, the determination of active phosphorus and nitrogen in water body sediments usually adopts an active method, that is, after the sediment is taken out of the water body, it is sent back to the laboratory for analysis. Since the sediment is in a reducing environment under the natural conditions of the water body, it is easy to change after it is taken out, resulting in analysis errors. The film diffusion gradient technology DGT, a passive sampling analysis method developed at present, can place a fixed gel film that can absorb phosphorus, nitrogen, sulfur, heavy metals and other elements in the in-situ sediment for enrichment, and then analyze it after taking it out. Indirectly obta...

AI Technical Summary

Problems solved by technology

However, the existing immobilized gel films can only selectively adsorb a single element, resulting in low analysis and determination efficiency, and cannot achieve in-situ simultaneous enrichment detection

In addition, since the nitrogen element in the natural environment mainly exists NO 3 -N and NH 4 -N two states, the adsorption rate consistency of the existing direct adsorption gel is poor, and the adsorption rate is not enough

Images