能量色散X射线荧光光谱法测定中草药中的Cd元素

利用能量散射X射线荧光光谱（ED-XRF）法快速测定中草药中的Cd元素.方法对中草药进行简单预处理（粉碎），使用X射线荧光光谱法建立中草药中Cd元素含量与相对强度的校正工作曲线，分析中草药样品中的Cd元素.Cd元素的检出限为0.083 mg/kg，定量限为0.207 mg/kg，定量限低于国家控制标准0.3 mg/kg.测量定量限以上的中草药样品时，其准确性与化学分析结果相当，重复性和稳定性等结果完全满足GB/T 4889-2008数据的统计处理标准.方法预处理时间不超过5 min，完成一个样品的检测时间不超过15 min，可应用于中草药生产企业中的重金属监控.

Determination of Cadmium in Chinese Herbal Medicine by Energy Dispersive X-Ray Fluorescence Spectrometery

A rapid energy dispersive X-ray fluorescence spectrometery(ED-XRF) was used to analysis cadmium in Chinese herbal medicine. A simple pretreatment method, such as crushing and grinding of Chinese herbal medicine was used. A calibration curve for the content and relative intensity of cadmium in Chinese herbal medicine has been set up using an energy dispersive X-ray fluorescence spectrometery, to analyse cadmium in Chinese herbal medicine samples. The limit of detection (LOD) and Limit of Quantity (LOQ) of this method were 0.083 mg/kg, and 0.207 mg/kg, respectively. And the LOQ of cadmium in Chinese herbal medicine was less than the national control standard 0.3 mg/kg. When measuring the sample containing cadmium above the LOQ, the accuracy of the test results was comparable to the results of the chemical analysis, and the repeatability and stability of the test results was in full compliance with the standard statistical treatment of data of GB/T 4889-2008. The pretreatment time of this method was no more than 5 min, and the test time of a sample was no more than 15 min. This method can be applied to the monitoring of heavy metal in Chinese herbal medicine manufacturers.