石墨炉原子吸收光谱法测定汽车用制动器衬片中铅含量的不确定度评定

Evaluation of Uncertainty of Lead Mercury Content in Automobile Brake Lining by Graphite Furnace Atomic Absorption Spectrometry

本文根据《化学分析中不确定度评估指南》对石墨炉原子吸收法测定汽车用制动器衬片中铅含量的不确定度进行了评定,分析了全部测定过程中测量不确定度的来源,包括测量重复性、样品称量、定容、测量试液中铅浓度等产生的不确定度。本次试验中,制动器衬片中铅含量为0.0430%,其扩展不确定度为0.0032% (k=2)。通过对不确定度的分析,建立了测定汽车用制动器衬片中铅含量不确定度的分析方法,为汽车用制动器衬片中有害元素铅含量测定等相关工作提供指导借鉴,为合理评价检测结果提供了科学依据。

In this paper,the uncertainty of lead in automotive brake linings has been evaluatedaccording to the Evaluation and Expression of Uncertainty in Measurement’,the sources of measurement uncertainty in all determination processes have been analyzed,including measurement repeatability,sample weighing process,constant volume processd and lead concentration of Sample solution.In this experiment,lead content in automotive brake linings was 0.043%,the relative expanded uncertainty was 0.0032%(k=2).Through quantitative evaluation,which could provide guidance and reference for the determination of harmful element lead content in automobile brake linings,and supplied scientific foundation to evaluation testing results reasonably.