摘要
Abstract
An analysis method was established for the determination of Se ( FV ) and Se ( VT) in soil samples by Hydride Generation-Atomic Fluorescence Spectrometry ( HG-AFS) , the key point being the selection of the extraction agent. In the past, there were so many kinds of extraction agents, but no pertinence. The extraction capacity of different extraction agents was compared and KH2PO4-K2HPO4 solution was selected for the experiment, which has a pH value of 8. 5. The total content of Se was measured by using 6 mol/L HC1 as reducing agent and being heated in a boiling water bath for 30 min. The content of Se ( IV ) was measured by the solution without heating in the boiling water bath. Finally, the content of Se( VI) was yielded by total Se content subtracted from the Se (IV). In the acidity condition of this experiment, the interference of coexisting elements was eliminated by adding Fe( HI ) salt. The relative standard deviation was 5. 0% - 12. 6% (re = 11) , linear range was 0. 00 -6. 00 |xg/L, the recovery was 90. 0% - 112. 5% and the detection limit was 0. 347 u,g/L. The method has been applied to determinate trace Se in reference materials and the results were in agreement with certified values. The results indicate that the method is simple, quick and highly sensitive. It is a feasible method to detect different valence states of Se in soil samples.关键词
土壤样品/硒/价态分析/提取/氢化物发生-原子荧光光谱法Key words
soil samples/ selenium/ valence state analysis/ extraction/ Hydride Generation-Atomic FluorescenceSpectrometry分类
农业科技
