化学转化顶空气相色谱法测定煤中碳酸盐二氧化碳

Determination of Carbonate CO_2 in Coal by Chemical Conversion Headspace Gas Chromatography

提出了一种测定煤中碳酸盐ＣＯ２的方法。煤样放入密闭体系中，注入盐酸，在室温下反应。当气液两相达到平衡后，取一定体积的液上气体进行色谱分析。通过测定气相中ＣＯ２含量，得出煤中碳酸盐ＣＯ２含量。方法简便、快速，相对标准偏差为２．４％；加标回收率在９６．３％～１０２．５％之间。用于实际样品分析，结果较为满意。

A method for the determination of carbonate CO2 in coal has been developed. The sample was put into a close system, then the HCl solution was injected. The reaction took place at room temperature. When two phase of gas and liquid attained equilibrium, the carbonate CO2 in coal was calculated by the determination of CO2 in headspace gas. The method was simple and fast. The relative standard deviation was 2.4% and the recoveries were in the range of 96.3% similar to 102.5%.