XRF法快速测定粉饼化妆品中Pb

Rapid determination of Pb in cosmetic powder by XRF

讨论了粉饼类化妆品的成分配比,通过添加分析纯Pb粉末,采用硼酸镶边垫底的粉末压样法,制备了用于X射线荧光分析的粉饼类化妆品Pb元素的标准样品,保证了标样和待测样品基体大致相同。在XRF分析过程中选择Pb Lβ作为分析线,建立了粉饼类化妆品Pb元素的工作曲线,其线性相关系数为0.9977,检出限为2.30μg/g。对市售5款粉饼化妆品进行了Pb含量检测,样品加标回收率为106%;待测样品RSD为2.7%(n=11);5款样品中有2款Pb含量略高于当前国标限值。

This paper investigated the composition of the powder cosmetics. The standard sample of powder cosmetics for Pb element in XRF analysis was prepared by adding pure Pb powder and using the pressed powder pellet sample preparation,which ensured the standards and the samples roughly the same. The calibration curve for Pb in powder cosmetics was obtained by choosing Pb Lβ as the analytical line with the linear coefficient of0. 9977 and the detection limit of 2. 30 μg / g. Using this method,5 different brands of city sold powder cosmetics were detected. The results indicated the accuracy and precision were good. The recovery of standards to No. 2sample was 106% and the RSD was 2. 62% within 11 times. The concentrations of Pb in 2 of 5 samples were slightly higher than the national standard limited value.