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采用微波消解技术处理食用菌样品,用石墨炉原子吸收光谱法测定食用菌中镉元素的含量。在最佳测定条件下,在0.400~2.00μg·L-1范围内镉的含量与吸光度呈线性关系(r=0.999 8),方法的检出限为0.006 mg·kg-1,方法的定量限为0.02 mg·kg-1,样品加标回收率为95.5%~101.9%,相对标准偏差(n=5)为2.56%~3.28%,方法快捷、准确、灵敏度高、精密度较好。结果表明,被检测的黑木耳和滑菇中镉的含量分别为0.06~0.18 mg·kg-1和0.02~0.11mg·kg-1,均低于国家食品卫生标准中食用菌的限量;被检测的香菇样品中镉的含量为0.37~1.62 mg·kg-1,超标率16.67%。
The samples of edible fungi were treated by microwave digestion and the content of cadmium in edible fungi was determined by graphite furnace atomic absorption spectrometry. Under the optimal conditions, the concentration of cadmium in the range of 0.400-2.00 μg · L-1 was linear with the absorbance (r = 0.999 8). The detection limit was 0.006 mg · kg-1. The limit of quantification The recoveries were 95.5% -101.9% and the relative standard deviations (n = 5) were 2.56% -3.28%. The method was rapid, accurate, sensitive and accurate. The results showed that the contents of cadmium in the tested fungus and the fungus were 0.06-0.18 mg · kg-1 and 0.02-0.11 mg · kg-1, respectively, which were lower than the limits of the national food hygiene standard. Of the sample of mushrooms cadmium content of 0.37 ~ 1.62 mg · kg-1, exceeding the standard rate of 16.67%.