【摘要】 建立了微波消解-石墨炉原子吸收光谱法测定土壤中微量钒的方法。确定了微波消解样品和石墨炉原子吸收光谱测定钒的最佳条件。以HNO3-HClO4-HF(3∶2∶3,V/V)作为样品的消解液,采用两段消解方式进行样品微波消解,并以EDTA作为基体改进剂,在HNO3(φ=5%)介质中进行钒的测定。方法的检出限为0.72μg/L,线性范围0~300μg/L,相关系数r≥0.998 5。方法用于土壤样品中钒的测定,相对标准偏差小于5%,回收率在98.2%~103.9%之间;有证参考物质的测定值与认定值相符。更多还原

【Abstract】 A method for determination of trace vanadium in soil by microwave digestion-graphite furnace atomic absorption spectrometry was developed.The microwave digestion precedure and determination conditions of graphite furnace atomic absorption spectrometry were optimized: two-step digestion mode was adopted with the mixed acid of HNO3-HClO4-HF(3∶2∶3,V/V) as digestion solution,EDTA as matrix modifier,and HNO3(φ=5%) as acid medium.The detection limit of the proposed method is 0.72 μg/L,linearity range is 0-300 μg/L,and correlation coefficient is r≥ 0.998 5.The proposed method has been applied to the determination of vanadium in soil samples with the relative standard deviation less than 5% and recovery of 98.2%-103.9%.For certified reference materials,the determination results are consistent with the certified values.更多还原