Ion chromatography single pump-column switching system for detecting trace inorganic anions in weak-acid salt

Abstract

The invention discloses an ion chromatography single pump-column switching system for detecting trace inorganic anions in weak-acid salt. The ion chromatography single pump-column switching system comprises a sample injection bottle, a quantitative ring, a first waste liquid bottle, an ion exclusion column, a high pressure infusion pump, a leacheate generator, an anion exchange chromatographic column, an anion suppressor, an electrical conductivity detector, a collecting pipe, a second waste liquid bottle, a six-way valve and a ten-way valve, wherein the leacheate generator is provided with an electrolysis device provided with a switch, the connecting sequence of adjacent joints of the six-way valve and the ten-way valve is adjusted, the ten-way valve and the six-way valve can form a loading mode and a sample injection mode respectively, and further the system forms four connecting states, the states of the system are adjusted according to the change of the state A, the state B, the state C, the state B, the state D and the state C. The invention also discloses a method used for detecting the trace inorganic anions in the weak-acid salt. The ion chromatography single pump-column switching system disclosed by the invention has the advantages that the interference generated by a high-concentration weak-acid anion structure can be effectively eliminated, and the determination of the trace inorganic anions in the weak-acid salt can be realized.

Description

1. Technical field: [0001] The invention belongs to an application system for chemical instrument analysis, in particular to an ion chromatography-column switching analysis system that uses a single pump and a single suppressor to measure trace inorganic anions in weak acid salts. 2. Background technology: [0002] After about 40 years of development, ion chromatography has become a mature technology for the determination of various ionic substances, including inorganic ions and dissociated organic small molecules, and has been widely used in the power and energy industries, electronics industries , food and beverage industry, chemical industry, pharmaceutical industry and life sciences, becoming an important branch of chromatographic analysis. For the inorganic ions in simple matrix samples, ion chromatography can be easily and directly determined. However, in the face of complex matrix sample analysis, simple ion chromatography analysis systems are no longer useful. There...

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Problems solved by technology

Due to the interference of high-concentration weak acid anions, the simple ion chromatography system can no longer meet the requirements of determination

At the same time, for different weak salt samples, due to the different retention time of matrix anions, the "heart-cut" (heart-cut) column switching technology and cyclic column switching technology need to optimize the column switching time according to different samples, which brings great confidence in the determination. here comes the trouble

So far, there is no ion chromatography-column switching analysis system using a single pump and a single suppressor, which is suitable for the determination of trace inorganic anions in various weak acid salts

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