化妆品中重金属的微波消解火焰原子吸收测定法

Determination of Heavy Metals in Cosmetics by Microwave Digestion and AAS

目的建立化妆品中重金属的微波消解原子吸收测定方法。方法微波消解75种化妆品,原子吸收分光光度法测定化妆品中重金属铅、铬、砷、镉和铜的含量,试验了不同消解条件对消解效果的影响。结果微波消解时间为25min,阶梯增加压力,采用HNO3(7ml)-H2O2(2ml)体系,消解效果较好;该方法最小检出浓度为0.05mg/L,线性系数为0.9987～0.9995,相对标准偏差为2.3%～6.8%,加标回收率为75.0%～98.3%。结论该法适用于化妆品中重金属的测定。

Objective To establish a method for determination of heavy metals in cosmetics with microwave digestion of samples and atomic absorption spectrometry.Methods Microwave digestion of samples with different digestion conditions and atomic absorption spectrometry were used to determine Pb,As,Cr,Cd and Cu contents in 75 kinds of cosmetics.Results In the system of nitric acid(7 ml)and hydrogen peroxide(2 ml),as increased the pressure gradually,the microwave digestion time was 25 minutes,a better result of digesti...