Atmosphere-pressure glow discharging detection method for metal ions and detection system

Abstract

The invention provides an atmosphere-pressure glow discharging detection method for metal ions and a detection system. The detection method includes the steps that by controlling oxygen doping, analyte is subjected to in-situ on-line capturing and enriched inside an APGD excitation source; after the analyte is pre-enriched for certain time, supplying of carrying gas, the gaseous analyte and oxygen is stopped, and the gas inlet end of the APGD excitation source is closed; after 1 s to 3 s, the gas inlet end of the APGD excitation source is opened again, supplying of the carrying gas and the gaseous analyte is recovered, disturbance is generated in the glow-discharge-plasma static environment inside the APGD excitation source, and the pre-enriched analyte is released. Disturbance is generated in the mode that an electromagnetic valve is controlled by a computer to be frequently turned on and off; software integrated control can be achieved in the enriching-releasing process, and the precision degree and the automation degree are high; as the complex and time-consuming pretreatment pre-enrichment process is replaced with the in-situ on-line pre-enrichment technology, the quantitative detection analysis efficiency of samples is greatly improved, and the detection limit is reduced by an order of magnitude.

Description

technical field [0001] The invention relates to a detection method and a detection system of metal ions, in particular to a method and a detection system of atmospheric pressure glow discharge detection of metal ions, which belong to the field of spectral analysis of analytical chemistry. Background technique [0002] With the increase of human activities, including the mining, smelting, processing and commercial manufacturing activities of various metal minerals in agricultural industry, metal ion pollution is becoming more and more serious. And it contains heavy metal elements with significant biological toxicity in terms of environmental pollution, such as mercury, cadmium, lead, antimony, chromium, and metalloid arsenic. If the heavy metal elements are not treated, they will be directly discharged into rivers, lakes or oceans, or enter the soil. , Because they cannot be biodegraded, these rivers, lakes, oceans and soils are polluted. Under the biomagnification of the foo...

AI Technical Summary

Problems solved by technology

However, the analytical performance of APGD excitation sources reported so far is still far behind that of large-scale laboratory instruments. The pre-enrichment of the elements to be detected through sample pretreatment (such as solid-phase extraction) can improve the analytical performance of APGD, but it will bring How to further improve the performance of APGD analysis in a simple and effective way has become an urgent problem to be solved

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