对气相色谱法测定气体中一氧化碳、二氧化碳和甲烷含量的不确定度进行了分析,找出影响不确定的因素,对测量不确定度进行计算和评定,结果表明影响其测量不确定度的主要因素是标准气体和色谱分析仪器产生的不确定度,并且通过不确定度分析与评定,能了解被测值所处的范围,反应检测结果的质量水平。 The uncertainty of the determination of carbon monoxide, carbon dioxide and methane in gas by gas chromatography was analyzed to find out the factors that affect the uncertainty and to calculate and evaluate the measurement uncertainty. The results showed that the main factors affecting the measurement uncertainty Is the uncertainty of the standard gas and chromatographic instruments, and through uncertainty analysis and assessment, can understand the scope of the measured value, the quality level of the reaction test results.