Manual sampling aid for gas chromatograph

Abstract

The invention discloses a manual sampling aid for a gas chromatograph. The manual sampling aid comprises a syringe; an L-shaped needle head protecting sheet, a syringe fixing sleeve and an adjustable syringe core rod pushing sheet are correspondingly arranged on a needle head arranged on the syringe, a syringe body and a syringe core rod; a syringe inlet is formed in the front side of the syringe fixing sleeve; a core rod pushing sheet sliding chute and a needle head protecting sheet sliding chute are formed in the back side of the syringe fixing sleeve; the core rod pushing sheet sliding chute is positioned in the inner layer; the needle head protecting sheet sliding chute is positioned in the outer layer; a buckle for hanging the core rod pushing sheet is arranged at the lower end of the core rod pushing sheet sliding chute; a syringe front-end buckle and a syringe tail-end buckle are correspondingly arranged at two ends of the syringe fixing sleeve; a spring is arranged between the tail end of adjustable syringe core rod pushing sheet and the syringe fixing sleeve; an adjustable syringe core rod pushing sheet stuck point and a needle head hole are correspondingly formed in the upper end and the lower end of the needle head protecting sheet. The manual sampling aid disclosed by the invention has the advantages of simple structure, easiness for operation, low cost, good reproducibility and the like; the sampling effect of the manual sampling aid is nearly close to that of an automatic sampler.

Description

technical field [0001] The invention belongs to the field of sample introduction of a gas chromatograph in the field of analytical chemistry, and in particular relates to a manual sample introduction assistant for a gas chromatograph. Background technique [0002] The development of gas chromatography technology has a history of half a century, and it is now a fairly mature and widely used method for the separation and analysis of complex mixtures. Gas chromatography belongs to column chromatography, which can be divided into packed column GC and capillary column GC according to the column. At present, most users use capillary column GC, but capillary column GC also has its limitations. Because of its small inner diameter, the column capacity is small, and the requirements for injection technology are higher. Generally, the injection volume of liquid samples is 1 μL to 2 μL. Conventional chromatographic sample injection methods include manual injection and automatic sample...

AI Technical Summary

Problems solved by technology

Syringe insertion time and sample injection time directly affect the analysis results, however, the manual injection method is difficult to maintain consistent injection speed for each sample, so the reproducibility is also poor

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