气相色谱法测定地下水中六六六结果的不确定度评定

依照《测量不确定度评定与表示》,对气相色谱法测定地下水中六六六(HCH)四种单体结果进行了不确定度评定。分析了测量过程中引入的不确定度来源,包括提取液体积的量取、样品提取溶液的定容体积、分析仪器的进样量、标准系列溶液的测量以及仪器重复测定等分量引入不确定度及其各参数的采集和计算方法,最后合成标准不确定度,通过乘以95%概率下的扩展因子2,获得测量结果的扩展不确定度。

Uncertainty Evaluation of Measurement Results for the Determination of HCH in Groundwater Samples by Gas Chromatography

Based on ,the measurement results of HCH in groundwater samples by gas chromatography(GC) were collected and the measurement uncertainty was evaluated.The sources of uncertainty produced in analysis process were discussed and the sampling volume for HCH extraction,volume fixing for HCH-extracted sample solution,sample volume introduced in GC instrument,measurement of the calibration standard solutions and the repetitive measurements of the instrument,etc.were considered as the main sources of the measurement uncertainty.The uncertainty expression parameters and mathematical models for calculating each parameter were also proposed.And the expanded uncertainty was obtained from synthesize standard uncertainty multiplied by expanded factor of 2 under the confidence level of 95%.