用于快速检测化妆品中重金属的样品前处理方法

Sample Pretreatment Method for the Rapid Detection of Heavy Metals in Cosmetics

通过4种典型前处理方案对化妆品中的重金属样品进行消解:(1)通过加硝酸和过氧化氢,静置过夜后在沸水浴中加热2 h,使化妆品中重金属被消解(国标前处理);(2)通过向样品中加入硝酸后在超声波作用下对化妆品样品进行快速消解;(3)通过向样品中加入硝酸和过氧化氢后在超声波作用下对化妆品样品进行快速消解;(4)通过在样品中加入王水、EDTA与离子液体在超声波作用下对化妆品样品进行快速消解。分别从准确度、消耗时间、回收率、精密度这4个指标着手,评价不同前处理方案效果。结果显示,采用超声辅助王水、离子液体消解法进行化妆品样品前处理时消耗的时间最短、回收率最高、精密度最好,是可用于快速检测防晒霜中铅含量测定的理想前处理方案。

Four typical pre-treatment procedures were used for the digestion of heavy metal in cosmetic samples.(1)Adding nitric acid and hydrogen peroxide, and let the mixture stand overnight heated in boiling water bath for 2 hours(GB pre-treatment).(2)Adding nitric acid under ultrasonication for rapid digestion.(3)Adding nitric acid and hydrogen peroxide under sonication for rapid digestion.(4)Adding aqua regia, EDTA,and ionic liquids under sonication for rapid digestion.Four indicators of accuracy, consumption time, recovery rate, and precision were used to evaluate different pre-treatment procedures.The results showed that the digestion method using ultrasonication, aqua regia, and ionic liquid obtained the shortest time, the highest recovery rate, and the best precision, which is an ideal pre-treatment method for the rapid detection of heavy metal like lead in sunscreen.