悬浮液进样石墨炉原子吸收光谱法测定环境样品中痕量铅

提出了悬浮液进样石墨炉原子吸收光谱法测定环境样品中痕量铅的分析方法.讨论了悬浮颗粒粒径、悬浮液浓度、悬浮稳定剂、基体改进剂等因素对测定结果的影响.实验结果表明: 样品粒径 < 38μm, 以0.2g/L的Triton - 100为悬浮剂, 3g/L的(NH₄)₂HPO₄为基体改进剂, 电磁搅拌进样可简便快速地测定地质样品中的痕量铅, 方法的检出限为0.10ng/g, 精密度为3.31% (n =10).43GSD标样测定结果与推荐值一致 

DETERMINATION OF TRACE LEAD IN ENVIRONMENTAL SAMPLES BY SLURRY SAMPLING WITH GRAPHITE FURNACE ATOMIC ABSORPTION SPECTROMETRY

A method has been developed for the determination of trace lead in the environmental samples by slurry sampling with graphite furnace atomic absorption spectrometry (GFAAS). The effects of particle size, slurry concentration, modifiers and slurry stability agents on the accurate determination are dealt with in this paper. The research shows that the particle size < 38 μm, the magnetic agitation with 0.2 g/L Triton-100 as stability agent, and the 3 g/L (NH₄)₂HPO₄ as a modifier are of practical use. The detection limit is 0.10ng/g, and the precision (RSD, n=10) is 3.31%. The analytical results of the standard reference samples are consistent with the certified values.