氢化物发生—原子荧光光谱法测定牙膏中的铅

Determining the Lead in the Toothpaste by the HG-AFS

目的：建立了一种测定牙膏中微量铅的方法——氢化物发生-原子荧光光谱法。方法：采用硝酸-高氟酸消解，氢化物发生-原子荧光光谱法测定。结果：线性范围为0～100μg／L，检出限为0．23μg／L，样品加标回收率为91．7％～102．1％，用标准物质茶叶（GBW10016）对该法验证，验证结果与推荐值一致，相对标准偏差为1．18％。结论：该法检出限低，线性范围宽，精密度好，准确性高，适合牙膏中微量铅的检测分析。

Objective： To develop a method for the determining of minute quantity lead in toothpaste by the hydride generation- atom fluorescence spectrum（ simplified in HG-AFS）. Methods： The samples were digested by the nitric acid and the perchloric acid, and determined by the HG-AFS. Results： The linear scale is 0- 100 μg/L, and the determining limit is 0.23 μg/L, and the recovery rate of the adding standard sample is 91.7 % - 102.1%. The presented method is verified by the standard matter tea（GBW10016）, the determining results according to the recommended value entirely, the relative standard deviation is 1.18%. Conclusion： The method presented is good at the followings aspects： the determining limit is low, the linear scale is broad, the accurate is high, so it is suitable to the determining the minute quantity lead in the toothpaste.