气相色谱法测定饮用水中三氯甲烷的不确定度评定

Evaluation on the Uncertainty in Determination of Trichloromethane in Drinking Water by Gas Chromatogragh

根据《测量不确定度评定与表示》(JJF1059.1-2012)对采用气相色谱法测定饮用水中三氯甲烷含量过程中可能引入不确定度的主要来源,并对各不确定度分量和测量结果的不确定度进行评定。当水样中三氯甲烷含量为0.0200 mg/L时,其扩展不确定度为0.0012 mg/L。影响气相色谱法测定生活饮用水中不确定度的因素主要是标准使用液的配制、测量的重复性和标准工作曲线拟合所产生的误差。

According to Evaluation and Expression of Uncertainty in Measurement（ JJF1059. 1- 2012）, the concentration of chloroform in drinking water was determined by gas chromatography. The causes of uncertainty from the program were analyzed and each component of uncertainty was evaluated. As the concentration of trichloromethane was0. 0200 mg / L,the expanded uncertainty was 0. 0012 mg / L. Preparations of standard solution,sample curve fitting and repeatability were the main sources of uncertainty in measurement.