微波消解-ICPMS法测定带鱼中总砷的不确定度分析

Uncertainty Evaluation for Determination of Total Arsenic in Hairtail by Microwave Digestion

[目的]分析微波消解-ICPMS法测定带鱼中总砷的不确定度。[方法]通过建立不确定度数学模型,分析测定过程中的不确定来源,对称样、消解液定容、标准溶液配制、样品均一性等不确定度分量进行计算,参照JJF 1059.1—2012和JJF 1135—2005的规定进行合成得出扩展不确定度。[结果]带鱼样品中总砷含量测定结果表示为w=0.100±0.007 88 mg/kg(置信概率为95%,k=2)。[结论]该分析方法适用于微波消解-ICPMS法测定带鱼中总砷的不确定度评定。

[Objective]The uncertainty of the content of total arsenic in hairtail was analyzed by the way of microwave digestion-ICPMS.[Method]The mathematical model of uncertainty was established. The sources of uncertainty during the process of measurement were analyzed.The uncertainty components including sample weighting,the final volume,preparation of arsenic standard solution were calculated and synthesised,then expanded uncertainty was obtained according to the provision of JJF 1059. 1-2012 and JJF1135-2005. [Result]The content of total arsenic in hairtail was determined to be 0. 100 ± 0. 007 88 mg/kg( the confidence level was 95%,k value was 2). [Conclusion]This method is applicable to the uncertainty evaluation during determination of the content of total arsenic in hairtail by microwave digestion-ICPMS.