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气相色谱分析中气体进样通常采用进样阀和注射器。用注射器进样,由于操作简便、灵活、重现性较好,是一种常用的工具。按色谱理论,进样快,柱效高,色谱峰的半高宽度受进样速度的影响。几年来,我们在从事 C_4—C_5等组分的分析中发现,用注射器进样时,快速进样由于针头的节流作用使针筒内气样在进样瞬间受压缩而产生气液平衡的变化,使分析结果造成很大的偏差。在分析 C_5以上样品及氧化氮等气体时同
Gas injections are commonly used for gas injection in gas chromatography analysis. Injection with a syringe, due to simple, flexible, reproducible, is a commonly used tool. According to chromatographic theory, fast injection, high column efficiency, half-height width of the peak by the injection speed. Over the past few years, we engaged in C_4-C_5 and other components of the analysis found that, when injected with a syringe, rapid injection because of the needle throttle effect so that the cylinder gas sample injection at the moment of compression and gas-liquid equilibrium Changes, the analysis results caused a great deviation. In the analysis of C_5 above samples and nitrogen oxide gas and the same