Analysis method for negative ion content in super-trace component

Abstract

The invention belongs to the technical field of water quality analysis, and particularly relates to an analysis method for negative ion content in a super-trace component. Two six-way valves are usedfor change of a single six-way valve in a conventional ion chromatography, one of the two six-way valves is used for large volume injection, the other one of the two six-way valves is used for concentration and enrichment, and meanwhile an external AXP pump is used to send a sample to an analytical column for analysis. The requirements of direct injection of the ion chromatography can be met, andby combination of an autosampler, automatic injection can be realized. The method has the advantages of high automation, good reproducibility, and the like, and can effectively solve the shortcomingsof the conventional ion chromatography and realize online and automatic analysis of the negative ion content in a super-trace component.

Description

technical field [0001] The invention belongs to the technical field of water quality analysis, and in particular relates to an analysis method for anion content in ultra-trace components. Background technique [0002] The content of conventional trace component anions (μg / L) can be measured by chemical methods or ion chromatography, but the conventional chemical analysis of ultra-trace component (ng / L) anions is limited by the complexity of the sample matrix and complicated operation steps , poor reproducibility and other factors have been unable to analyze. [0003] Ion chromatography is widely used in the analysis of anion content in trace components. However, it is limited by the high pressure of the system when large-volume injection improves detection sensitivity. AS-HV autosampler cannot send large-volume samples to the analytical column. for analysis. If a concentrating column is used, due to reasons such as the complexity of the sample matrix, the determination res...

AI Technical Summary

Problems solved by technology

[0002] The content of conventional trace component anions (μg / L) can be measured by chemical methods or ion chromatography, but the conventional chemical analysis of ultra-trace component (ng / L) anions is limited by the complexity of the sample matrix and complicated operation steps , poor reproducibility and other factors, it has been impossible to analyze

[0003] Ion chromatography is widely used in the analysis of anion content in trace components. However, it is limited by the high pressure of the system when large-volume injection improves detection sensitivity. AS-HV autosampler cannot send large-volume samples to the analytical column. to analyze

If a concentrated column is used, due to the complexity of the sample matrix and other reasons, the determination results of individual anions will be poor.

[0004] Therefore, in order to solve the problem that ion chromatography cannot be directly analyzed in the water ammonia system, it is urgent to develop an analysis method for anion content in ultra-trace components, using a large quantitative tube to directly inject samples and a guard column as a concentration column. An analysis method in which the plunger pump sends the sample to the analytical column to realize continuous and automatic analysis of anions in high-purity water

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