石墨炉原子吸收光谱法和电感耦合等离子体质谱仪法测定稻谷中镉的含量

    Determination of Cadmium Content in Rice by Graphite Furnace Atomic Absorption Spectrometry and Inductively Coupled Plasma Mass Spectrometry

    • 摘要: 比较分析用于稻谷中镉含量测定的两种检测方法。通过微波消解-石墨炉原子吸收光谱法和微波消解-电感耦合等离子体质谱仪法(ICP-MS)两种不同的分析方法,检测稻谷中镉的含量,分析过程中测试样品通过加标准样和加质控样来共同验证。测试结果显示:两种方法在标准规定的质量浓度呈线性关系(r>0.999),回收率在88%~105%范围内,质控样品测试结果符合证书要求。两种不同分析方法的结果都符合国家标准指标,但电感耦合等离子体质谱仪方法检出限、精确度、稳定性优于石墨炉原子吸收光谱法。

       

      Abstract: The two methods for the determination of cadmium in rice were compared and analyzed. The content of cadmium in rice was detected by microwave digestion-graphite furnace atomic absorption spectrometry (GFAAS) and microwave digestion-inductively coupled plasma mass spectrometer (ICP-MS), and the test samples were verified by adding the standard samples and the quality control samples. The test results showed that the two methods showed a linear relationship in the mass concentration stipulated in the standard (r>0.999), and the recovery rate was within the range of 88%-105%. The test results of the quality control samples met the certificate requirements. The results of the two different analytical methods were in line with the national standards, but the detection limit, accuracy and stability of the ICP-MS method were better than that of the GFAAS method.

       

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