• 中文核心期刊
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氢化物发生-原子荧光光谱法直接测定多金属矿中的硒和碲

Determination of Selenium and Tellurium in Polymetallic Minerals by Hydride-generation Atomic Fluorescence Spectrophotometry

  • 摘要: 用硝酸-氢氟酸-高氯酸分解多金属矿物样品,在6 mol/L 盐酸介质中,以Fe3+盐为减缓剂,直接在双道原子荧光光度计上同时测定多金属矿中硒和碲。该方法用同一混合酸一次分解样品,不经分离富集,同时测定硒和碲,过程简单快捷,适合于批量样品的检测。将样品与标准曲线同时分解至冒高氯酸白烟,从而准确地测定多金属矿物样品中硒和碲的含量。方法检出限为硒0.032 μg/g,碲0.023 μg/g;方法精密度(RSD,n=8)为硒<4.0%,碲<7.0%。经国家一级标准物质GBW 07283、GBW 07233、GBW 07234验证,硒和碲的测定值与标准值吻合。

     

    Abstract: A method for determination of selenium and tellurium in polymetallic minerals by hydride-generation atomic fluorescence spectrophotometry was developed. The samples were decomposed with HNO3-HF-HClO4. In 6 mol/L HCl media and using Fe3+ as relieving reagent, selenium and tellurium in the sample solutions were directly determined by double channel atomic fluorescence spectrophotometer. The detection limits of the method were 0.032 μg/g for selenium and 0.023 μg/g for tellurium. The method has been applied to the determination of selenium and tellurium in National Standard Reference materials and the results are in agreement with certified values with precision of less than 4.0%RSD for selenium and less than 7.0%RSD for tellurium (n=8). The method also provides the advantages of easy sample pretreatment, is more efficient and suitable for determination of selenium and tellurium in polymetallic minerals.

     

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