Determination of Impurity Elements in High Purity Graphite by ICP-MS after Mixture Acid Digestion in Reflux Condenser System
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摘要: 建立冷凝回流混合酸消解，ICP-MS法测定高纯石墨中35种痕量元素的方法。采用1 mL HNO3，1 mLHClO4和3 mL H2SO4于220 ℃消解0.2 g 样品，以Sc、Rh、Cs、Re作内标，ICP-MS法测定各元素的方法检出限为0.000 6~0.1 μg•L-1，加标回收率达82%~110%，相对标准偏差（RSD，n=10）为0.58%～5.8%。该方法适用于高纯石墨中痕量杂质含量的测定。
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关键词:
- 冷凝回流 /
- 高纯石墨 /
- 电感耦合等离子体质谱(ICP-MS) /
- 痕量杂质
Abstract: The method of determination of 35 trace impurity elements in high purity graphite was established. Samples were digested by the mixture of 1 mL HNO3，1 mL HClO4 and 3 mL H2SO4 at 220 ℃ in reflux condenser system. Sc, Rh, Re and Cs were utilized as internal standards to correct the signal drift. The detection limit of various elements is from 0.000 6 μg•L-1 to 0.1 μg•L-1, the recovery rates are between 82% and 110%, the RSD(n=10) is in the range of 0.58% and 5.8%. The method is suitable for the determination of impurity elements in high purity graphite. -
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