膏霜类化妆品的预处理及多种微量元素的测定

Pretreatment of Cream Cosmetic and Determination of its Trace Element Concentrations

用HNO3 H2 SO4 HClO4消化法、HNO3 H2 SO4消化法、(HNO3 HClO4)混合酸 H2 SO4消化法三种预处理方法处理膏霜类化妆品样品 ,并以ICP AES法直接测定样品中铜、铬、镉、锰、锌、铅的含量 .结果显示 ,采用 (HNO3 HClO4)混合酸 H2 SO4消化法预处理样品 ,能够得到较好的效果 ,测定方法加标回收率为 93 6 % - 1 0 3 8% ,1 0次测定的RSD (n =1 0 )小于4 89% ,方法操作方便 ,分析速度快 。

A sample of cream cosmetic was pretreated with three different digestion methods for comparison.namely,HNO 3-H 2SO 4-HClO 4 digestion,HNO 3-H 2SO 4 digestion,and mixed(HNO 3+HClO 4)-H 2SO 4 digestion,with its Cu,Cr,Cd,Mn,Zn and Pb concentrations determined directly by ICP-AES.It has been found that the best pretreatment method is the mixed (HNO 3+HClO 4)-H 2SO 4 digestion,with its indexed recovery rate at 93 6%-103 8% and its relative standard deviation (RSD) for 10 times lower than 4 89%.The method is rapid,accurate and easy to operate.