稻谷中铅含量测定的测量不确定度的评估

王亚军 陈嘉东 潘传荣 钟国才 陈威

广东省粮食科学研究所,广州510050

摘　要:随机选取2007年广东省产的稻谷样品一份，用原子吸收分光光度计石墨炉法测定样品中铅含量，参考批学分析中测量不确定度的评估指南》的方法，分析铅含量测定过程中的测量不确定度的主要来源，包括溶液定容体积、称量、样品溶液铅浓度测定和测量重复性，计算合成不确定度和扩展不确定度。在该样品铅含量测定中，稻谷样品中铅含量为0．097mg/kg，其扩展不确定度为0．0024mg/kg（置信度95％，包含因子K=2）。[著者文摘]

Uncertainty evaluation of measurement results for the determination of lead in paddyWANG Ya-jun, CHEN Jia-dong, PAN Chuan-rong, ZHONG Guo-cai, CHEN Wei Gunagdong Institute for Cereal Science Research, Guangzhou 510050Abstract:The article firstly chose some sample of paddy grew in GuangDong province, the lead content in paddy was determined by graphite furnace atomic absorption spectrometry （GFAAS）.Then according to 〈The Guide of Uncertainty Evaluation for Measurement of Chemical analysis〉, the main sources of the measurement results were evaluated including preparation of various chemical solutions, sample weighting, the certified values of standard referenced materials and the instruments stability and etc. The total uncertainty for the determinations of lead by GFAAS was combined and was calculated. In this analysis, the expanding uncertainty is 0.0024 mg/kg with lead content 0.097 mg/kg.[著者文摘]

Key words:uncertainty evaluation; graphite furnace atomic absorption spectrometry; lead; paddy