Ion chromatograph -double anode electrochemical hydride generation atomic fluorescent on-line combined system

Abstract

The invention relates to an ion chromatography-binode electrochemical hydride generation atomic fluorescence on-line combined system, which comprises a liquid chromatography pump, an admission valve, an ion chromatographic column, a three-way connecting device, a peristaltic pump, a binode electrochemical hydride generator, a four-way connecting device, a gas-liquid separator and an atomic fluorescence photometer. Element compounds of different forms in a sample are separated on the ion chromatographic column, the separated components are reduced to gaseous hydride on the binode electrochemical hydride generator, the gaseous hydride after undergoing gas liquid separation through the gas-liquid separator is led into the atomic fluorescence photometer by carrier gas for detection, and signals are recorded and processed by a self-developed work station. The ion chromatography-binode electrochemical hydride generation atomic fluorescence on-line combined system successfully realizes effectively converting the element compounds of different forms separated by the ion chromatographic column into hydride on line, and introduces an atomic fluorescence detection system on line, thereby establishing a simple, quick, sensitive, accurate, economical and reliable new technologic platform for element form analysis.

Description

technical field [0001] The invention relates to a combined system of chemical analysis instruments, in particular to an online combined system of ion chromatography-double anode electrochemical hydride generation atomic fluorescence. Background technique [0002] The toxicity and biological importance of an element depend on its chemical form. The toxicity of many elements in different forms and valence states is very different. These elements include arsenic, selenium, lead, bismuth, etc. Taking arsenic as an example, different forms of arsenic The toxicity of inorganic arsenic (including trivalent arsenic As 3+ and pentavalent arsenic As 5+ ) is the most toxic, methylated arsenic (including monomethyl arsenic MMA and dimethyl arsenic DMA) is less toxic, and arsenobetaine (AsB), arsenocholine (AsC), arsenosugar (AsS), arsenic Lipids (AsL) and the like are generally considered to be of very low or non-toxicity. Therefore, the determination of the total amount of elements ...

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Problems solved by technology

Therefore, the determination of the total amount of elements can no longer meet the research needs in the fields of environmental science, life science, medicine and health, and it is very necessary to develop simple, fast, sensitive and accurate element speciation analysis and determination methods

[0003] At present, the most effective method for elemental speciation analysis is the technology based on the combination of chromatographic separation and element feature detection. Low detection limits and multi-element detection capabilities play an important role in speciation analysis, but the traditional quadrupole ICPMS has a long equilibration cycle, which limits work efficiency, is expensive, and has high operating costs, thus limiting this hyphenated technology. popularization of

In recent years, high-performance liquid chromatography coupled with atomic fluorescence (HPLC-AFS) technology has attracted much attention from researchers for elemental speciation analysis. Its sensitivity and detection limit are comparable to those of HPLC-ICPMS, and its cost is low and its efficiency is high. , but all use traditional chemical reducing agents (such as potassium borohydride, sodium borohydride, etc.) The precision, and bring pollution to the environment

So far, there is no technical report on the use of electrochemical hydride generators for the interface between HPLC and AFS

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