顺序注射氢化物发生-原子荧光光谱法测定酒中痕量铅

采用顺序注射氢化物发生-原子荧光光谱法测定酒中痕量铅。在盐酸载液中加入2.5%（V/V）无水乙醇,可以对测定系统进行较好的清洗,改善了测量的稳定性。对载液酸度、硼氢化钾浓度等实验条件进行了研究,工作曲线在Pb浓度5.0～80μg/L的范围内线性关系良好,相关系数r=0.9992,检出限为0.24μg/L,相对标准偏差为1.8%,加标回收率为96%～103%。适用于白酒、葡萄酒和啤酒样品中痕量铅的测定。

Determination of Trace Lead in Alcohol by Sequential Injection Hydride Generation-Atomic Fluorescence Spectrometry

A method for the determination of trace lead existed in alcoholic beverage using sequential injection hydride generation-atomic fluorescence spectrometry was proposed. The detection system could be cleaned better by added 2.5%（V/ V） absolute alcohol into the HC1 carrier, and the stability of detection was improved, The operation conditions including the concentrations of HC1 and KBH4 were studied. There was a good linear relationship between the fluorescence intensity and lead concentration in the range of 5.0080μg/L with a correlation coefficient of 0.9992, The detection limit was 0.24μg/ L and the relative standard deviation（n=11）was 1.8%. The recovery was in the range of 96%-103%. It is applied to the determination of trace lead in distilled spirits, wine and beer with satisfactory results.