微波消解-石墨炉原子吸收光谱法测定大米中的痕量砷

Determination of trace arsenic in rice by microwave digestion and graphite furnace atomic absorption spectrometry

目的:建立一种灵敏与准确测定大米中痕量砷的微波消解-石墨炉原子吸收光谱法。方法:通过优化基体改进剂的种类和用量、灰化温度、原子化温度,得到最佳的测定条件。结果:利用该方法,能准确、灵敏地测定大米中的痕量砷,方法在0μg/L^50.0μg/L的范围内呈良好的线性,线性相关系数为0.9999,方法的检出限为0.81μg/L,加标回收率为90.2%~112.0%,RSD为0.8%~7.9%。结论:本方法简便、快速、准确,灵敏度和精密度高,能有效监测大米中的痕量砷,具有较强的实用性。

Objective： To develop a sensitive and accurate method for determination of trace arsenic in rice samples by microwave digestion and graphite furnace atomic absorption spectrometry. Methods： The parameters, such as the type and dosage of matrix modifier, the temperature of incineration and atomization, were optimized. Results： The trace arsenic in rice samples could be accurately and sensitively analyzed by the established method. The assay was linear in the range of 0μg/L - 50.0 μg/L with good correlation （ r = 0. 9999）. The limit of detection was 0.81 μg/L. The average recoveries were in the range of 90.2% - 112.0%, and the relative standard deviations were 0.8% -7.9%. Conclusion： The established method is simple, fast, accurate, sensitive and precise for the determination of trace arsenic in rice samples.