石墨炉原子吸收光谱法测定皂树皮提取物中铅的不确定度评定  

Assessment of Lead determination uncertaintyin quillaia extract by GFAAS

作　　者：胡曙光[1] 苏祖俭 蔡文华[1] 王晶[1] 黄伟雄[1] 范建彬 黄泓耀 

机构地区：[1]广东省疾病预防控制中心国家食品安全风险监测重金属参比实验室,广州511430 [2]中山大学公共卫生学院,广州510080

出　　处：《中国食品添加剂》2017年第8期182-187,共6页China Food Additives

基　　金：广东省医学科学技术研究基金项目(C2016007)

摘　　要：目的:探讨石墨炉原子吸收光谱法测定皂树皮提取物中铅不确定度的评定方法。方法:用原子吸收光谱仪测定皂树皮提取物样品中铅含量,根据该分析过程的测量数学模型从样品称量、样品定容、标准溶液配制、标准曲线测定、样品和空白测定等方面进行测量不确定度的计算。结果:样品X_1铅含量为1.28 mg/kg,扩展不确定度为0.090 mg/kg(k=2);样品X_2铅含量为3.90 mg/kg,扩展不确定度为0.250 mg/kg(k=2)。结论:测量过程中的不确定度主要来源于方法的回收率、样品空白变动性、消化液中铅浓度和重复性。通过建立测量数学模型,可对石墨炉原子吸收光谱法测定固体样品中铅测量的不确定度进行合理的评定。Object：To study and assess the uncertainty of Lead in quillaia extract by graphite furnace atomic absorption spectrometer（GFAAS）. Method：The Lead contents in two quillaia extract samples（X_1 and X_2）were determinate by GFAAS and the uncertainties were calculated by sample weight,volume,standard solution preparation,standard curveinthe mathematical model. Result：The Lead content in sample X_1 was 1.28 mg/kg and the expanded uncertainty was 0.090 mg/kg（k=2）. The Lead content in sample X_2 was 3.90 mg/kg and the expanded uncertainty was 0.250 mg/kg（k=2）. Conclusion：The recovery,variability of the blank,lead content in digestive solution and duplicability were four major factors in calculating the uncertainty. The reasonable assessment of measuring uncertainty could be made for determination of Lead in solid samples by GFAAS through establishing a mathematical model.

关 键 词：石墨炉原子吸收光谱法 铅 不确定度 

分 类 号：TS26[轻工技术与工程—发酵工程]