Determination of trace lead and mercury in airborne particles by hydride generation atomic fluorescence spectrometry
Determination of trace lead and mercury in airborne particles by hydride generation atomic fluorescence spectrometry作者机构：College of Chemistry and Environmental Science Hebei University Baoding 071002 China
出 版 物：《Journal of Environmental Science and Engineering》 (环境科学与工程（英文版）)
年 卷 期：2009年第3卷第1期
页 面：14-20页
学科分类：082803[工学-农业生物环境与能源工程] 0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学] 08[工学] 0828[工学-农业工程] 0804[工学-仪器科学与技术]
主 题：microwave digestion-atomic fluorescence spectrometry atmosphere particles lead mercury
摘 要：A new method for determination of trace lead and mercury by hydride generation atomic fluorescence spectrometry （HG-AFS） was established. Lead was determined in the medium of citric acid using potassium ferricyanide （K3Fe（CN）6） as oxidant. Ni enhanced the fluorescence signals in this system. Mercury was determined in the medium of nitric acid using mixture of thiourea and ascorbic acid as masking reagent, sodium dioctylsulphosuccinate （SDSS） as enhancing reagent. The working mechanism of the hydride generation of lead and mercury was discussed. Interferences of some coexisting ions were studied systematically and the determination conditions were optimized. Under the optimized conditions, the detection limits of the method were 0.31μg.L^-1 for lead and 0.023 μg·L^-1 for mercury, and the relative standard deviations based on eleven determinations of 5.00 μg·L^-1 standard of Pb and Hg, were 2.6% for Pb and 2.2 % for Hg. This method was applied to the analysis of lead and mercury in four different diameter airborne particles after microwave digestion. Results suggested heavy metal elements easily concentrated in smaller particles.
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