原子吸收法测定水样中铅含量的测量不确定度评定

Evaluation of Uncertainty Measurement of the Lead Content in Water Samples by AAS

根据GB/T7475-1987,使用原子吸收光度法测定水质样品中铅的含量,按照JJF1059-1999《测量不确定度评定与表示》的要求对测定结果进行不确定度评定。分析测定过程中不确定度来源,计算各不确定度分量,求出合成不确定度和扩展不确定度,给出测定结果报告。当样品铅含量为1.31 mg/L时,测量结果的扩展不确定度为0.05 mg/L,k=2。

According to GB/T7475-1987,the lead content in water samples was determined by atomic absorption spectrophotometry, and the uncertainty of the determination result was evaluated on the requirement of （（Evaluation and Expression of Uncertainty in Measurement）） （JJF1059-1999）. Analyzing the sources of uncertainty in the entire course of the determination and calculating each component of uncertainty, the combined uncertainty and expanded uncertainty were obtained, and the determination result of the copper content was also given. While the lead content in detected samples is 1.31 mg/L, the extend uncertainty of the determination result was 0.05 mg/L, k=2.