Gas chromatograph pillar for volatile gaseous state arsenic compounds separation and preparation method thereof

Abstract

The invention provides a gas chromatographic column and a preparation method used for the separation of volatile gas arsenic compounds, which belongs to the field of chemical detection technique and is used for solving the problem that the normal chromatographic column is not suitable for the separation of volatile gas arsenic compounds. The technical proposal of the invention is that the chromatographic column body is a flexible PTFE column body and the filling material is a power-shaped polysiloxane stationary phase of 80-100 meshes. The filling material is filled by a blowing positive-pressing filling method. The invention can meet the specific requirement of the separation of the gas arsenic compounds and has the advantages of strong plasticity, easy cutting, being convenient for being bent and good adaptability, can bear the low temperature of minus 196 DEG C and the high temperature of 200 DEG C, has outstanding performance of chemical corrosion resistance, and can realize the butting with collecting devices and detection devices conveniently. The blowing positive-pressing filling method provided by the invention has the advantages of convenience, simpleness, low requirementon the operation skillfulness, etc., with the filling density, column effect and repeatability completely meeting the separation requirement of the gas arsenic compounds.

Description

technical field [0001] The invention relates to an analysis instrument, in particular to a gas chromatographic column for the separation of volatile gaseous arsenic compounds, and belongs to the technical field of detection. Background technique [0002] In actual environmental monitoring and scientific research, the standards of gaseous arsenic compounds are usually derived from the reduction reaction between a reducing agent (such as sodium borohydride solution, etc.) and the corresponding water-soluble arsenic compounds. The boiling point of gaseous arsenic compounds is very low, and it is gaseous at room temperature. It is not only time-consuming to separate volatile gaseous arsenic compounds with capillary gas chromatography columns, but also difficult to achieve online with other detectors (such as ICPMS, AFS and other special effect atomic detectors). It is even less likely to be connected with an on-line derivation (generation) device of gaseous arsenic compounds. T...

AI Technical Summary

Problems solved by technology

Therefore, at present, the separation of volatile gaseous arsenic compounds usually uses cold trapping technology and adopts low-temperature chromatographic separation, but this method has the following problems in actual operation: the commercialized gas chromatography packed column (i.e. gas chromatography column) ) Usually the column is longer and the packing density is higher. When connecting with other detectors or standard derivative devices, it is easy to generate a large pre-column pressure, which is easy to cause pipeline leakage.

At the same time, the preparation and separation mechanism of these chromatographic packed columns is mainly based on volatile organic compounds, and it is difficult to find a chromatographic column that is very suitable for the rapid separation of volatile gaseous arsenic compounds. In addition, most of the gas chromatographic packed columns on the market use glass tubes or stainless steel Equirigid tubes are used as columns, which are prone to damage or corrosion, and the chromatographic column cannot be bent and adapted

In short, there is no gas chromatographic column with good separation effect at home and abroad, which is convenient to be used with special effect atomic detector and gaseous arsenic compound derivation (generation) device at the same time.

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