用于快速定量塑料中微量元素的标准样品制备方法研究

采用色母粒法制备含重金属元素的电子信息产品(塑料)的标准样品,建立了标准样品制备的程序;利用X射线荧光光谱仪(XRF)定量分析方法,考察了标准样品测定重金属和溴元素含量的重复性以及不确定度,建立了标准样品工作曲线的测定程序及测定电子信息产品实际样品的方法和程序.结果表明,利用该方法制备的标准样品在200～2 000 mg·kg-1浓度范围内,测量有机物中微量Pb,Hg,Cr,Br元素及在20～200mg· kg-1浓度范围内测量Cd元素,均获得了非常好的线性关系,并经六次检测具有很好地重复性,并以日本三菱重工公司的电路板ICB288和ICB288G作为实际样品进行测试,其结果与推荐值一致.

Standard sample preparation method for quick determination of trace elements in plastic

Reference sample was prepared by masterbatch method, containing heavy metals with known concentration of electronic information products (plastic), the repeatability and precision were determined, and reference sample preparation procedures were established. X-Ray fluorescence spectroscopy (XRF) analysis method was used to determine the repeatability and uncertainty in the analysis of the sample of heavy metals and bromine element. The working curve and the metrical methods for the reference sample were carried out. The results showed that the use of the method in the 200-2000 mg x kg(-1) concentration range for Hg, Pb, Cr and Br elements, and in the 20-200 mg x kg(-1) range for Cd elements, exhibited a very good linear relationship, and the repeatability of analysis methods for six times is good. In testing the circuit board ICB288G and ICB288 from the Mitsubishi Heavy Industry Company, results agreed with the recommended values.