微波压力消解-原子荧光法测定土壤及其小麦中有害元素砷的研究

为测定小麦中的微量砷,并研究其自然迁移规律和生物吸收比的特性,以河南省安阳县白壁镇郭盆村的土壤和小麦为样品,用微波炉密闭消解体系进行消解,用氢化物-原子荧光法进行测定,在优化的测定条件下,砷标准曲线的工作范围为0～80μg/L,相关系数r>0.999,检出限为0.073 1μg/L,仪器测定标准溶液的RSD为1.4%(n=11),加标回收率为91.57%～107.1%.研究结果表明小麦中砷的生物吸收比随土壤中总砷含量的增加而增加,但小于1%.

Study of Harmful Element Arsenic in Soil and Wheat with Hydride Generation Atomic Fluorescence Spectrometry after Sample Digested in High-pressure Microwave Oven

Detect the content of arsenic in soil and wheat and invest the correlation between them.A closed vessel microwave oven digestion system is used for dissolution of soil and wheat samples.Determination of arsenic in samples by atomic fluorescence spectrometry.In the given conditions,the determination range of standard curve of arsenic is 0～80 μg / L with r> 0.999,while detection limit is 0.073 1 μg / L,the RSD of detect standard solution is 1.4 %(n=11),the recovery between 91.57 % and 107.1 %.The bio-absorptance of arsenic in wheat that is increscent with content of total arsenic in soil,but then not more than 1 %.