水浴消解-原子荧光法测定土壤中的砷汞

Determination of Arsenic and Mercury in Soils using Water Bath Digestion Coupled with Atomic Fluorescence Spectrometry

建立了王水水浴消解-原子荧光法测定土壤中砷汞的方法，确定还原剂为硼氢化钾，测砷和汞时硼氢化钾的最优质量分数分别为2％和0．05％，载流为5％盐酸。该法砷和汞分别在质量浓度O．O～40．Oμg/L和O．OO～4．00μg/L范围内线性良好，相关系数均〉0．9995，砷和汞的检出限分别为0．009和0．001mg／kg，相对标准偏差分别为3．90％和2．67％，加标回收率分别为94．1％～107．6％和92．O％～104．O％。采用本法对国家标准土壤样品和东海县部分农田土壤样品进行测定分析，结果良好，表明该法操作简单、灵敏度高、实用性好，适用于土壤中砷和汞的测定。

A method for determining arsenic and mercury contents in soils was established using water bath coupled with atomic fluorescence spectrometry. Potassium borohydride was used as the reducing agent,and the optimal mass fraction for determining arsenic and mercury was 2% and 0. 05%,respectively. 5% Hydrochloric acid was used as the carrying fluid. The linearity was good for arsenic and mercury in the range of 0. 0 ~ 40. 0 μg / L and 0. 00 ~ 4. 00 μg / L,respectively. The correlation coefficients were above0. 999 5. The respective detection limits of arsenic and mercury were 0. 009 and 0. 001 mg / kg,and relative standard deviations( RSDs) were 3. 90% and 2. 67%,respectively. Recoveries for arsenic were 94. 1% ~ 107. 6%,and 92. 0% ~ 104. 0% for mercury. The method was used well to analyze the national standard soil samples and farmland soil samples of Donghai County. The results proved that the method was simple,sensitive,practical and suitable for determining arsenic and mercury contents in soils.