Potential type micro electrode sensor capable of being used for ion detection in settlings and application thereof

Abstract

The invention relates to a potential type micro electrode sensor, in particular to a potential type micro electrode sensor capable of being used for ion detection in settlings and application thereof.The potential type micro electrode sensor is a polymer film ion selective micro electrode, and consists of a gold micro electrode, a PEDOT (PSS) conduction layer and an iron selective polymer film; the iron selective polymer film is prepared by mixing ion selective carriers containing ions to be detected and lipophilic ion exchangers (quadri(3,5-bis(trichloromethyl)phenyl)sodium borate accordingto the mol ratio of (1:2)-(1:4) and then adding polyvinyl chloride and o-nitrophenyl octyl ether. The solid contact type micro electrode has the advantages that the manufacturing is simple and convenient; the sensitivity is high; the cost is low; the miniaturization is easy, and the like. Meanwhile, the micro electrode mass transfer speed is high; the current density is great; the response speed is high, and the like. The ion field in-site analysis in settlings can be realized; the detection on various ions in the settings can be realized through changing the types of ion carriers in the ion selective films.

Description

Technical field [0001] The invention relates to a potential type microelectrode sensor, in particular to a potential type microelectrode sensor which can be used for the detection of heavy metal ions in deposits and its application. Background technique [0002] Sediment is the source and sink of heavy metal pollution. After heavy metal enters the water body, it enters the sediment through absorption, flocculation and precipitation. Pore ​​water in marine sediments refers to the aqueous solution that occupies the pores between seabed sediment particles and rock particles. When the physical and chemical conditions (such as pH, Eh) change, heavy metals will dissolve into the pore water through the diffusion layer and enter the upper surface. Covering water bodies, causing secondary pollution. [0003] At present, the monitoring of heavy metals in domestic sediments, especially in-situ monitoring methods are very limited. Thin film balancing technology can achieve high-resolution de...

AI Technical Summary

Problems solved by technology

Disadvantages: (1) The disturbance effect cannot be avoided; (2) The operation process is cumbersome; (3) The degree of analysis is limited

[0007] In recent years, a low-detection-limit miniature polymer membrane ion-selective electrode that can detect micro-upgraded samples and has a sensitivity as high as picomolar has been born. Combined with solid contact electrode technology, this type of electrode has been successfully used in environmental monitoring and other fields; but , when measuring sediments, the mechanical strength of the electrode is required to be high, so there is an urgent need for a universal microelectrode suitable for measuring sediments

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