气相色谱仪单样标定方法研究

Study on the calibration method for single sample in gas chromatography

为了实现色谱仪标定工作的简捷、准确和有效,阐述了色谱分析技术的绝对校正因子、相对校正因子等概念,以甲烷(C1)为基准物质,通过实验方法测定了乙烷(C2)、丙烷(C3)、异丁烷(iC4)等物质的相对校正因子参数值,线性拟合了甲烷的工作曲线刻度以及采用经验公式拟合了C2、C3和iC4相对甲烷的校正因子与体积分数之间的关系,通过两组实验结果比较,证明了多点单样标定方法适用于精度要求不高的色谱仪器,并说明了单点单样标定方法的运用过程。利用拟合得到的相对校正因子与体积分数之间的经验公式,编制了单点单样与多点单样标定方法计算软件。

In order to make the chromatography calibration work simpler,more accurate and effective,the article describes the absolute correction factor and the relative correction factor concepts for chromatographic analysis,taking methane(C1) as the base substance,the authors determined the relative correction parameter values of the ethane(C2),propane(C3),butane(iC4) and other substances by the experiment,linearly fitting the methane working curve as well as fitted the relationship between the other correction factor being relative to the methane and the volume fraction by the empirical formula.It was proved by comparing the two groups of experimental results that the multi-spots single-sample calibration method is suitable for the chromatography with less precision,and the authors illustrated the process of single-spot single-sample calibration method.The software for the calculation method of single-spot single-sample and multi-spots single-sample was made by the empirical formula of the relation between the relative correction factor and the volume fraction obtained from fitting.