工作场所空气中苯乙烯气相色谱分析的不确定度评定

Evaluation of Uncertainty in Determining Styrene in Workplace Air by Gas Chromatography

[目的]分析工作场所空气中苯乙烯浓度不确定度,找到影响测量质量的重要因素。[方法]通过建立气相色谱法测定苯乙烯的数学模型,列出所有影响苯乙烯测定结果的各个参数的不确定度来源,对各个不确定度来源进行评估、量化。[结果]苯乙烯测定的扩展不确定度为1.2 mg/m(3k=2)。[结论]在工作场所空气中苯乙烯浓度测定过程中,标准溶液的选择、标准曲线的绘制以及结果的重复测定是影响结果可靠性的重要环节。

[Objective] To identify the key factors influencing the quality of determination through analyzing the uncertainty of styrene concentration in workplace air by Gas Chromatography（GC）.[Methods] Through establishing the mathematical model for styrene determination by GC,origins of uncertainty of various parameters influencing styrene concentration measured by GC were listed,evaluated and quantified.[Results] The extended uncertainty of styrene determination was 1.2 mg/m^3（k=2）.[Conclusion] The study showed the choice of standard solutions,the plotting of standard curves and the repeated measurements were key factors influencing the reliability of results from determination of styrene concentration in workplace air.