氢化物-原子荧光法测定粮食中的砷

Determination of Trace Arsenic in Corn by Hydride Generation Atomic Fluorescence Spectrometry

研究了氢化物－原子荧光法测定粮食中砷的适宜条件，试验了酸介质和还原剂的用量对测定砷的影响，选择了仪器的最佳工作条件及氢化物发生条件，试验了生成氢化物元素及粮食中常见元素对测定的干扰情况。在测定条件下，砷的线性范围为０～８０μｇ／Ｌ，检出限为０．３μｇ／Ｌ。用该法测定了标准物质小麦粉及大米，结果与推荐值吻合。方法快速、准确，应用于进口粮食中砷的检测。

A method is reported for the determination of trace arsenic in corn by hydride generation atomic fluorescence spectrometry. The effect of the medium amounts of acid, and reducing agent on the determination of As were investigated. The operating condition of the instrument and hydride generation were optimized. The interference from elements forming hydride compound and coexistent elements in corn were studied, too. In the given conditions, the linear range of determination is 0～80 μg/L, while detection limit is 0.3 μg/L. As in the stardand wheat flour (GBW08503)and rice(GBW08502) were determined by this method in agreement with certified values. The method is simple and rapid,and it has been applied to the determination of As in imported corn with satisfactory results.