氢化物发生原子荧光法测定硅藻土中砷

Determination of arsenic in diatomaceous earth by hydride generation-atomic fluorescence spectrometry

目的：为了建立硅藻土中砷的原子荧光光谱测定方法。方法：样品经处理,使用硫脲-抗坏血酸-碘化钾混合溶液作为预还原剂,研究了硅藻土中砷的原子荧光光谱测定方法的最佳测定条件。结果：本法选择20 g/L KBH4溶液作为还原剂,50 g/L硫脲-50 g/L抗坏血酸-50 g/L碘化钾混合溶液作为预还原剂,线性范围为0-10μg/L,相关系数r≥0.9999,检出限为0.026μg/L,加标回收率为92.3%-109.3%%,相对标准偏差为3.67%。结论：该方法简便快速、灵敏度高、准确度好,适合硅藻土中砷的测定。

Objective：To study the determination of arsenic（As） in diatomaceous earth by hydride generation-atomic fluorescence spectrometry（HG-AFS）.Methods：A method had been studied for the determination of As in the best condition in diatomaceous earth by hydride generation-atomic fluorescence spectrometry.Results：Reducer was 20 g/L KBH4.Pre-reducer was mixed solutions with 50 g/L thiocarbamide,50 g/L ascorbic and 50 g/L potassium iodide.r was 0.9999 in the range of 0-10 μg/L.The detection limits was found to be 0.026 μg/L.Recoveries was in the ranges of 92.3%-109.3%.RSD was 3.67%.Conclusion：Using this method to determine As in diatomaceous earth is simple,reliable,sensitive and accurate.