Sample preprocessing device provided with ion chromatograph and used for detecting anions and use method

Abstract

The invention discloses a sample preprocessing device provided with an ion chromatograph and used for detecting anions and a use method. The device comprises a sample liquid suck-in pipe, an absorption liquid storage bottle, a flushing liquid storage bottle, a sample liquid peristaltic pump, an absorption liquid peristaltic pump, a flushing liquid injection pump, a dialysis pool, an anion exchanger, a six-way valve, an absorption liquid storage ring and the ion chromatograph. The sample liquid peristaltic pump, the absorption liquid peristaltic pump, the ion chromatograph and the flushing liquid injection pump are all connected with a computer terminal. During dialysis, sample liquid flows, and absorption liquid stops flowing; when absorption liquid is transferred to the absorption liquid storage ring, sample liquid stops flowing, and absorption liquid flows; when the six-way valve is switched, the flushing liquid injection pump flushes absorption liquid in the storage ring to an anion enrichment column in the ion chromatograph. The device has the advantages of online removing heavy metal ions, being low in measurement limit, high in sample adaptability, mild in condition and free of toxic reagents, being matched with the ion chromatograph, and being capable of measuring various anions in sewage or acrylic fiber solvent within 20 min.

Description

technical field [0001] The invention belongs to the category of analytical chemistry and includes flow injection technology, membrane dialysis technology, column capture technology and valve switching technology. The invention relates to an automatic sample pretreatment device for an ion chromatograph, which can realize the on-line pretreatment of conventional inorganic anion and acrylic solvent anion tests in wastewater. Background technique [0002] Ion chromatography (IC) has developed rapidly since its advent in the 1970s, and is considered to be the most effective method for analyzing ionic substances, especially suitable for the rapid and simultaneous determination of multi-component inorganic and organic anions and cations. Ion chromatography is also known as the conventional 7 kinds of anions (F - , Cl - , NO 2 - 、Br - , NO 3 - 、PO 4 3- , SO 4 2- ) and some small molecule organic acids (such as CHO 2 - 、CH 3 CO 2 - ) detection method - strong selectiv...

AI Technical Summary

Problems solved by technology

The so-called "Yinglan" automatic online sample pretreatment technology developed by well-known foreign manufacturers with the dialysis unit and suppression unit as the core, and the so-called "Principle" automatic online sample pretreatment technology based on ten-way valve switching and solid phase extraction column technology Technology, as their ion chromatography-specific supporting equipment, directly analyzes 'dirty' samples and complex matrix samples, which solves the problem of contamination and purification of ion chromatography columns by the complex matrix of samples, and also greatly improves the measurement results and accuracy of complex matrix samples. The sensitivity of the analytical method is improved, but it is difficult to automate the matching with other manufacturers' ion chromatographs, and the structure is also slightly complicated. Although there are many functions, only one can be used at a time, and the combination still needs to be assembled.

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