微波消解-石墨炉原子吸收法测定金丝菊中镉的含量

本文采用硝酸-过氧化氢混合溶液,使用全自动微波消解仪消解金丝菊代用茶中的重金属镉,定容后用石墨炉原子吸收光谱法进行测定。结果表明,镉的工作曲线相关系数>0.995,相对标准偏差<4.4%,国家标准物质测定值在标示值范围内,回收率为92.5%~106.6%。该方法快速、准确,能够满足日常食品中镉的分析要求。

Detection of Cadmium in Chrysanthemum morifolium by Microwave Digestion-GFAAS

In this paper,the heavy metal cadmium in gold chrysanthemum substitute tea was dissolved with a mixture of nitric acid and hydrogen peroxide using a fully automatic microwave digestion instrument,and then determined by graphite furnace atomic absorption spectrometry after fixing the volume.The results showed that the correlation coefficient of the working curve for cadmium was>0.995 with a relative standard deviation<4.4%,the recoveries were 92.5%~106.6%within the range of the indicated values for the national standards.The method is rapid,accurate and can meet the requirements of daily analysis of cadmium in food.