原子吸收光谱法测定铝合金中铅含量测量结果的不确定度评定

Analysis of the Uncertainty for the Determination of Plumbum in Aluminium Alloy by AAS

通过对原子吸收光谱法测定铝合金中铅的不确定度的系统分析,阐述了测量结果不确定度主要来源于测量试液中铅的浓度、试液定容体积及样品质量产生的不确定度,并对这些分量进行了量化计算,最后计算出合成标准不确定度和扩展不确定度。同时通过评估,得出影响铅含量测定不确定度的主要因素是测量试液中铅浓度引起的不确定度。

The uncertainty for the determination of Pb in aluminium alloy was analyzed by AAS.The sources of the uncertainty resulted from the determination of Pb concentration in the solution,the volume of the solution and the weight of the sample were discussed and calculated.At last the combined standard uncertainty and the expanded uncertainty were reported.At the same time,through evaluation,it was indicated that the mostly factor affecting the uncertainty for the determination of Pb was the uncertainty of Pb concentration in the solution.