微波王水消解不赶酸原子荧光光谱法测定土壤中的砷

Determination of Arsenic in Soil Sample by Atomic FluorescenceSpectrometry with Microwave Digestion

摘要: 采用微波消解土壤样品不赶酸的情况下利用原子荧光光谱法测定土壤中的砷.结果表明：微波王水消解土壤样品不赶酸情况下，砷的测定值均在国家标准物质ESS-1的推荐值范围内.砷的线性范围分别为0.0~50.0 μg/L,相关系数为r=0.9995.按称取0.2 g样品，定容至50 mL，求出砷检出限为0.5 mg/kg.砷回收率为93.4%~100.9%之间，相对标准偏差(n=4) 为0.39~4.56%.结果表明：微波王水消解不赶酸原子荧光光谱法测定土壤中的砷，灵敏度高，操作简便快速，结果准确可靠.

Abstract: A method to determine As in soil sample that digested with aqua regia in microwave oven without dispelling acid and determined by HG-AFS is to develop. The results showed that the tested value of arsenic in microwave digestion with aqua regia without dispelling acid was within the recommended value of ESS-1. Under optimal conditions,the linear range of arsenic was at 0.0~50.0 μg/L, the correlation coefficient was 0.9995; The parallel determination was done 4 times by ESS-1 and GSS-2; the relative standard deviation was 0.39%~4.56% respectively; The recovery of arsenic was 93.4%~100.9%;The detection limits of arsenic was 0.5 mg/kg. The results suggested that the method is simple to operate with high accuracy for the determination of the content of arsenic in soil sample by atomic fluorescence spectrometry with microwave digestion.