X荧光光谱法测定玩具饰品中的重金属含量

摘要

In this contribution, the concentration of heavy metals, such as Cr、Cd、Pb、Hg in different kinds of toys was measured by X-ray fluorescence spectrometry. The toys measured include plastics, met al, ceramics and so on. Without any sample pretreatment, the concentration of heavy metals in samples with different size, shape and attribute were detected after the instrument preheated and initialized. The measurement time for one sample is 2~3 minutes. The limit of detection is 2ppm and the RSD is less than 4. 6%. The instrument used in this context is made in homeland and the cost of operation and maintain is relative low, which make it suitable for real-time filed analysis. The method developed here is fast, simple and nondestructive for the determination of heavy metals(Cr、Cd、Pb、Hg) in toys and accessories.%采用X荧光光谱法测定了塑料、金属、陶瓷等多类玩具饰品表面中的重金属Cr、Cd、Pb、Hg含量.仪器预热初始化后,对不同大小,不同形状,不同属性的样品无需做任何的预处理,直接无损测定其表面重金属的含量.单个样品测定时间为2～3分钟,可连续不间断测定,检测限低,可达2mg/kg,相对标准偏差低于4.6％.所用仪器为国产仪器,仪器成本及运行和维护成本低,应用于现场实时分析,便于推广.该法具有分析速度快、操作简单、对样品无任何损坏等特点,用于玩具饰品中重金属Cr、Cd、Pb、Hg含量的测定,简单,实用.