氢化物发生辅助雾化火焰原子吸收法测定人发中的铅

使用氢化物发生辅助雾化的火焰原子吸收法，在K₃Fe(CN)₆-HCl体系中，测定了头发中铅的含量。对酸度、氧化剂及浓度、NaBH₄的浓度及流速对Pb测定的影响分别进行了研究。与传统雾化火焰原子吸收法相比，本方法测铅的灵敏度提高了13.4倍。方法的检出限为2.8 μg·L-1，精密度(RSD)为1.4%。用于测定人发中的Pb，回收率达96%～99%。

Determination of Lead in Human Hair Using Flame Atomic Absorption Spectrometry and Nebulization Assisted with Hydride Generation

Lead in human hair was determined using flame atomic absorption spectrometry and nebulization assisted with hydride generation and K3Fe(CN)6-HCl system. The method is simple and rapid for operation. The performance of the method was compared with conventional flame atomic absorption spectrometry for direct determination of lead. An improved sensitivity by 13.4 fold was obtained compared to the conventional FAAS for direct determination of lead. The effects of several experimental parameters on the lead determination were optimized, and the influences of interference ions on the determination were investigated. The limit of detection (3sigma) of the proposed method was 2.8 microg x L(-1). The method has been applied to the determination of human hair sample satisfactorily with a recovery of 96%-99%.