塞曼效应石墨炉原子吸收光谱法直接测定乳汁铅(英文)

Direct Determination of Lead in Human Milk by Graphite Furnace Atomic Absorption Spectrometer with Zeeman Correction

[目的 ]探讨塞曼效应石墨炉原子吸收光谱法直接测定乳汁铅的方法。 [方法 ]样品不用前处理 ,采用标准曲线法 ,用基体改进剂以 1:4稀释后直接进样测定 ,并进行了质量控制分析。[结果 ]方法的线性范围为 ( 0～ 15 0 ) μg/L .批内精度(RSD % )在 2 .1～ 6.0之间 ,批间精度 (RSD % )在 5 .8～ 8.1之间 ,特征浓度是 1.0 μg/L ,检出限 :当 3σ时是 0 .3 μg/L ,回收率在96 7%～ 10 3 .9%之间。分析的血铅标准物质 (SRM 95 5 ,美国标准物质局生产 )值是 ( 5 8.6± 3 .2 ) μg/L ,与其参考值 ( 5 7.0± 5 .0 )μg/L比较 ,在误差范围内。[结论 ]方法灵敏、简单 。

Objective To study the method for determining human milk lead by Graphite Furnace Atomic Absorption Spectrometry(GFAAS). [Methods] Human milk lead was determined by GFAAS.The sample was diluted 1:4 in volume with the matrix modifier and nitric acid,the standard calibration curve was employed and the quality control was executed.Lead in milk sample was determined directly by GFAAS without digestion. [Results] The lead concentration curve was linear within the range of(0～150) μg/L.The precision(RSD%)was 2.1～6.0 for within-batch and 5.8～8.1 for between-batch.The limit of detection was 0.3 μg/L,based on three times the S.D.The determined lead level of the SRM 955 blood lead reference material from National Bureau of Standard(NBS in USA) was(58.6±3.2) μg/L.It was within the permissible error range compared to the reference value(57.0±5.0)μg/L. [Conclusion] The proposed method is sensitive and simple. The accuracy and precision can meet the requirement.