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]