微波消解-ICP-MS法测定化妆品塑料包材中9种重金属

Determination of Nine Heavy Metals in Cosmetic Plastic Packaging Materials by Microwave Digestion-ICP-MS

摘要: 通过微波消解法对化妆品塑料包材的前处理方法进行分析研究，比较了四种不同消解体系下对塑料包材消解效果的影响，结果发现硝酸–盐酸混合体系消解效果最佳，采用电感耦合等离子体质谱法(ICP-MS)测定塑料包材中的铬、钴、镍、硒、锶、锆、锑、钡、铊9种金属元素，各元素的检出限为0.005~0.2 mg/kg，线性良好，相关系数均大于0.999。同时对方法进行精密度试验与加标回收实验，各金属元素的加标回收率在94.0%~106.5%之间，相对标准偏差(RSD) 0.93%~5.9%。该方法有较好的准确度和精密度，适合用于化妆品塑料包材中9种重金属元素的测定。

Abstract: This study analyzes and investigates the pretreatment method of cosmetic plastic packaging materials through microwave digestion. The effects of four different digestion systems on the digestion efficiency of plastic packaging materials were compared, and it was found that the nitric acid-hydrochloric acid mixed system provided the best digestion results. Inductively Coupled Plasma Mass Spectrometry (ICP-MS) was used to determine nine metal elements—chromium, cobalt, nickel, selenium, strontium, zirconium, antimony, barium, and thallium—in the plastic packaging materials. The detection limits for these elements ranged from 0.005 to 0.2 mg/kg, with good linearity and correlation coefficients all greater than 0.999. Precision tests and spike recovery experiments were conducted on the plastic packaging materials, with recovery rates of the metal elements ranging between 94.0% and 106.5%, and relative standard deviations (RSD) between 0.93% and 5.9%. This method demonstrates good accuracy and precision and is suitable for the determination of the nine heavy metal elements in cosmetic plastic packaging materials.