摘要
目的:建立一种简便准确的氢化物发生-原子荧光光谱法检测食品中的痕量铅的方法。方法:采用干法消解样品,在酸性介质中,以铁氰化钾为氧化剂,2%的盐酸为载流,样品中的铅与硼氢化钠(NaBH4)或硼氢化钾(KBH4)反应生成铅的挥发性氢化物(PbH4),将氢化物导入原子化器中,检测其荧光强度。结果:铅在0.00μg/L^50.0μg/L范围内,荧光强度值与铅浓度相关系数r>0.9990,检出限为0.094μg/L,相对标准偏差0.80%~4.70%,加标回收率82.1%~104.0%。结论:应用改进后的氢化物发生-原子荧光法检测食品中痕量铅,具有操作简便、线性关系好、检出限低、重复性好、回收率高、结果准确的优点,且分析成本低廉,便于推广应用。
Objective：To establish a simple and accurate determination method for trace lead in food by hydride-generation atomic fluorophotometry.Methods： Use dry method to digest samples.In acidic medium,with potassium ferricyanide as the oxidant,2% of hydrochloric acid as the current-carrying,the lead in samples and sodium borohydride（NaBH4） or borohydride potassium（KBH4） react and product lead volatile hydride（PbH4）.Put hydride into atomizer and detect the fluorescence intensity.Results： Lead range was between 0.00 μg/L^50.0 μg/L,the correnlation coefficient of fluorescence intensity value and plumbum concentration 0.9990,DL=0.0938ug/L,RSD was between 0.80%~4.70%,spike recovery was between 82.12%~101.2%.Conclusion： The results indicate that improved hydride generation-atomic fluorophotometry is applied to detect trace lead in food,with the advantages of not only simple operation,good linear relationship,low detection limit,good repeatability,high efficiency and accuracy,but low cost and easy application.
出处
《中国卫生检验杂志》
CAS
2011年第6期1334-1337,共4页
Chinese Journal of Health Laboratory Technology
基金
昆明市西山区2010年科技专项项目(20100112)
关键词
食品
痕量铅
氢化物发生-原子荧光法
Food
Trace lead
Hydride generation-atomic fluorophotometry
作者简介
彭俊（1968-），女，本科，主任技师，主要从事卫生检验。
