微波消解-石墨炉原子吸收光谱法快速测定大米中痕量镉  

Rapid determination of trace cadmium in rice by microwave digestion and graphite furnace atomic absorption spectrometry

作　　者：李坤[1] 胥艳[1] 

机构地区：[1]河南省开封市疾病预防控制中心,河南开封475000

出　　处：《中国卫生检验杂志》2013年第7期1700-1702,共3页Chinese Journal of Health Laboratory Technology

摘　　要：目的:探讨微波消解-石墨炉原子吸收法检测大米样品中痕量镉的快速分析方法。方法:对大米样品采用硝酸-微波消解和以及消解后高温快速赶酸的方法进行前处理,以0.5%硝酸钯-0.5%磷酸二氢铵混合液为基体改进剂,石墨炉原子吸收光谱法进行测定,标准曲线法进行定量。结果:镉标准溶液质量浓度在0 ng/ml^2 ng/ml范围内线性关系较好,相关系数r为0.9994,方法加标回收率为87.1%~92.6%,相对标准偏差(RSD)小于5.0%。结论:该方法操作简便,安全,快速,精密度、准确度较高,适用于大米中微量镉的测定。Objective： To study and develop the analytical method for rapid determination of trace cadmium in rice by microwave digestion with graphite furnace atomic absorption spectrometry （GFAAS）. Methods： The rice sample was pretreated by quick exorcising acid from digestion solution under high temperature after microwave digestion, then the digested samples were added mixed modifier （ containing 0.5 % palladium nitrate and 0.5 % ammonium dihydrogen phosphate solution）, determined by GFAAS and quantified by standard curve method. Results：A linear relationship between the cadmium content and absorbency was found in the range of 0ng/ml - 2.0ng/ml with the correlation coefficient of 0. 9994. Recoveries were 87.1% - 92.6 % with relative standard deviations （RSD） less than 5%. Conclusion： The results indicated that the method was convenient, safe, rapid, accurate, reliable and suitable for measurement of cadmium in rice.

关 键 词：微波消解 石墨炉原子吸收光谱法 大米 痕量镉 

分 类 号：O657.31[理学—分析化学]