ICP-OES测定大米中镉的方法研究

目的 建立电感耦合等离子体发射光谱（ICP-OES）测定大米中镉含量的分析方法。 方法 用微波消解法消化样品,微波消解前后用加热方式进行样品的预消化及赶酸处理,ICP-OES法测定。 结果 样品消解完全。镉浓度在0mg/L~5.0mg/L范围内线性好,r=0.9999,方法的检出限为0.02mg/kg。三个浓度水平下的相对标准偏差（RSD）为0.42%~2.32%,回收率在86.0%~108.3%之间,结果符合检测方法确认的技术要求。 结论 方法简便、灵敏度高,准确度和精密度好,可用于大米中镉含量的测定。

Detection of cadmium in rice by inductively coupled plasma optical emission spectrometry

Objective To develop the method for rapid determination of cadmium in rice by Inductively Coupled Plasma Optical Emission Spectrometer (ICP-OES). Methods The samples were digested by microwave digestion, measured by ICP-OES . Results The samples were digested completely . Good linearity was obtained in a range of 0mg/L~5.0mg/L ,with correlation coefficients 0.9999.The limit of detection(LOD) was 0.02 mg/kg. The recoveries were 86.0%~108.3% at the concentrations levels of three ,with relative standard deviation（RSD）of 0.42%~2.32%.The determination results accorded with the technical requirements of the test method . Conclusion The method was sensitive, accurate, selective and available to determine the cadmium in rice.