果汁中铅含量的测量不确定度评定

Uncertainty evaluation of lead in juice

根据现行国家标准GB 5009.12-2010第一法(石墨炉原子吸收法,GFAA),对果汁中的铅含量进行检测.分析了不确定度来源,建立了铅的不确定度数学模型,并依据JJF1059.1-2012《测量不确定度评定与表示》,对果汁中铅含量的不确定度进行评定.其结果为果汁中铅含量为0.013 mg/L,合成标准不确定度为0.069 mg/L,扩展不确定度为0.14 mg/L.

Based on the first method in GB 5009. 12- 2010（ the first method,GFAA）,the content of lead in juice was determined in this paper. The source of uncertainty was analyzed,and the mathematical model was built,the uncertainty evaluation of lead in juice was made. The result indicated that the content of lead in juice was 0. 013 mg/L,the combined standard uncertainty was 0. 069 mg/L,and the expanded uncertainty was 0. 14 mg/L.