原子荧光光谱法测定土壤和水系沉积物国家标准物质中砷

用王水浸提法和硝酸-高氯酸-氢氟酸混合酸消解法处理样品,原子荧光光度光谱法测定土壤和水系沉积物国家标准物质样品中的砷。方法检出限为0.02 mg/kg。两种前处理方法砷的测定值与标准值相符,均可以满足土壤和水系沉积物样品中砷含量的测定要求。单纯测定样品中砷含量时,王水浸提法更好;如果在测定砷同时还要测定其他元素,则可以选用混合酸消解法。

Determination of Arsenic in National Standard Reference Soil and Stream Sediment Samples by Atomic Fluorescence Spectrometry

Two sample preparation procedures (Aqua regia and HNO3-HClO4-HF mixture acid) were used to dissolve the National Standard Reference soil and stream sediment samples and arsenic in the sample solution was then determined by atomic fluorescence spectrometry (AFS). The detection limit of the method for As was 0.02 mg/kg. The analytical results from both sample preparation procedures were in agreement with certified values, showing that these sample preparation methods can satisfy the requirements of arsenic determination in soil and stream sediment samples and aqua regia dissolution procedure was better than the other one when only arsenic is determined. For multi-element analysis (including As), HNO3-HClO4-HF mixture acid procedure is recommended.