X射线荧光光谱法测定滑石粉中组分含量

Determination of Components in Talcum Powder by X-ray Fluorescence Spectrometry

介绍了硼酸粉末压片X射线荧光光谱法测定滑石粉中SiO_(2)、MgO、Fe_(2)O_(3)、Al_(2)O_(3)、CaO组分含量的定量分析方法。根据滑石中主次成分含量范围,采用市售滑石粉标准样品和经化学分析方法定值的生产产品作为标样绘制校准曲线;以经验系数基体校正方法消除吸收与增强效应影响;采用硼酸作混合剂,滑石粉(200目-400目)与硼酸的质量比为5∶1,经振动磨研磨充分混匀,再用压样机压制表面光滑的样片;精密度试验和比对试验表明:该分析方法测定标样与标准值的误差完全在国家标准允许误差范围内,测定滑石粉中组分含量,检测值与化学法检测值相符,实现了简单、快速、准确的测定。

A quantitative analysis method for the determination of SiO_(2),MgO,Fe_(2)O_(3),Al_(2)O_(3) and CaO in talcum powder by X-ray fluorescence spectrometry with boric acid powder tablet was introduced.According to the content range of primary and secondary components in talc,the calibration curve is drawn by using the commercially available talc standard sample and the production product which has been determined by chemical analysis method as the standard sample.Eliminate the influence of absorption and enhancement effect by empirical coefficient matrix correction method.Boric acid is used as the mixing agent,and the mass ratio of talcum powder(200~400mesh)to boric acid is 5:1,which is fully mixed by vibration grinding,and then the sample with smooth surface is pressed by a press machine.The precision test and comparison test show that the error between the standard sample and the standard value determined by this analysis method is completely within the allowable error range of the national standard.The content of components in talcum powder is determined,and the detection value is consistent with the detection value by chemical method,which realizes simple,rapid and accurate determination.