微波消解-氢化物发生原子荧光法测定紫阳高硒区土壤硒含量的方法研究

目的]利用微波消解-氢化物发生原子荧光法,测定紫阳高硒区土壤中的硒含量。方法]以浓硝酸和双氧水(10+2)为消解剂,采取以微波消解的方法对紫阳富硒区土壤样品进行处理,采取氢化物发生-原子荧光光谱法测定土壤中硒含量,并设定最佳的样品处理条件和仪器测定条件。利用加标回收试验,对试验方法进行了验证。结果]紫阳富硒区土壤硒含量为16.28 mg/kg,达到高硒土壤标准。该方法硒的检出限达到0.15μg/L,硒回收率为92.0%~101.8%,相关系数达0.999 9,线性范围为0~100 mg/kg。结论]该微波消解的方法对土壤总硒的测定结果准确且稳定,线性范围宽,节约时间。

Determination of Se in Soils of Ziyang High Selenium Region by Microwave Digested-Hydride Generation Atomic Fluorescence Spectrometry

Objective] Determination of Se in the soil with high selenium in Ziyang area by Microwave Digested-Hydride Generation Atomic Fluorescence Spectrometry.Method] The samples were first treated by nitric acid and hydrogen peroxide （10 ＋ 2） of microwave digestion,then the trace arsenic and selenium in soil of Ziyang high selenium region were determined by hydride generation-atomic fluorescence spectrometry.The experimental conditions for treating and analyzing samples were optimized.Result] The results indicated that the selenium content in soil of Ziyang high selenium region is 16.28 mg/kg,the detection limits were 0.15 g/L,the selenium recovery rate was 92％-101.8％,the correlation coefficient was 0.999 9,the linear range 0-100 mg/kg.Conclusion] The method of microwave digestion of total selenium determination result is accurate and stable.It also saves the chemical reagents and time.