气相色谱-质谱法测定水中挥发性有机物的测量不确定度评定

Uncertainty evaluation of analyzing VOC_s in water by GC/MS

根据测量不确定度评定与表示理论,采用气相色谱-质谱法测定水中挥发性有机物。以氯乙烯为例,通过计算和评定,得出当氯乙烯的测量结果为4.99μg/L时,取包含因子k=2(约95%置信概率),扩展不确定度U=0.96μg/L。该不确定度评定方法在实际工作中具有较强的实用价值。

According to uncertainty theory, the method uncertainty of analyzing VOC in water by GC/MS was evaluated. Taking vinyl chloride for example, the results show that the extended uncertainty U = 0. 96μg/L, when the concentration of vinyl chloride is 4.99μg/L with the coverage factor k = 2 （ the confidence probability is 95% ）. This evaluation method of uncertainty is of practical value.