铅是我国粮食卫生标准中的毒理学指标,原子吸收光谱法是测定粮食中铅的方法之一。按照GB/T27025-2008《检测和校准实验室能力的通用要求》的规定,检测实验室应具有并应用评定测量不确定度的程序。文中根据JJF 1059-1999《测量不确定度评定与表示》、CNAL/AG06《测量不确定度政策实施指南》技术规范的要求,对石墨炉原子吸收光谱法测定铅含量的测量不确定度进行分析,获得不确定度评定结果,建立了测定铅不确定度的分析方法。

Lead is toxicological index of china's grain health standard and can be determined by atomic absorption spectrometry. According to GB / T27025- 2008《General requirements for the competence of testing and calibration laboratories,the testing laboratory should have and apply the procedure of estimation the uncertainty of the measurement. According to the technical requirements of JJF 1059—1999《Evaluation and expression of uncertainty in measurement》and CNAL / AG06《Measurement uncertainty policy implementation guide,the uncertainty of measurement in determination of the lead content of grain with the graphite furnace atomic absorption spectrometry were analyzed and the uncertainty evaluation results were obtained. These results help us to established the method of lead uncertainty analysis and provide scientific basis for the rationally evaluation of our laboratory detection results.