摘要
采用气相色谱法测定气体样品中非甲烷总烃的含量。通过分析甲烷、总烃和氧气测量过程中不确定度的来源,对各不确定度分量进行评定。评定结果表明:非甲烷总烃的测量不确定度主要来源于标准气体。当非甲烷总烃的测定结果为3.50mg/m3时,其扩展不确定度为0.68mg/m3(k=2),该样品的测定结果为(3.50±0.68) mg/m3。
The content of nonmethane hydrocarbons in gas samples was measured by gas chromatography. By analyzing the sources of uncertainty in the measurement of methane, total hydrocarbons and oxygen, the uncertainty components were evaluated. The evaluation results show that the measurement uncertainty of nonmethane total hydrocarbons mainly comes from standard gases. The expanded uncertainty is 0.68 mg/m3(k=2) when the determination result of nonmethane total hydrocarbons is 3.50 mg/m3, and the determination result of this sample is(3.50 ±0.68) mg/m3.
引文
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