微波消解-氢化物发生原子荧光光度法 测定土壤中的砷

建立了微波消解一氢化物发生原子荧光光度法测定土壤中砷的方法。对微波消解条件进行了优化，用5mL硝酸和2mL过氧化氢的混合酸作消解溶剂，在设定的微波条件下砷提取完全。用5％的盐酸作为反应载流，12g／L硼氢化钾与0．5％氢氧化钠的混合液为还原剂，直接定容后应用HG．AFS测定，并通过测定国家标准参考物质和加标回收实验，对方法进行了验证。实际土壤加标同收率97％～103％。

Determination of Arsenic in Soil Samples Using the Method of Microwave Digestion Hydride Generation Atomic Fluordscence Spectrometry

A simple and rapid method for determination of arsenic in soil samples by microwave digestion followed by hydride generation atomic fluorescence spectrometry was developed. The microwave digestion process were optimized. A mixture of 5 mL ni- tric acid and 2 mL hydrogen peroxide was used as digestion solvent, with which the arsenic in soil samples can be sufficiently extrac- ted. 5% of hydrochloric acid was used as carrier,and a mixture of 12 g/L of potassium borohydride and 0.5% of sodium hydroxide was used as reducing agent. For four certified reference materials ,the values of Hg obtained by this method were in good agreement with the certified values. The recoveries of spiked samples were over the range between 97% and 103%.