氧弹燃烧-原子荧光光谱法测定煤中汞含量
王昌钊,吴双民,张遴
陕西出入境检验检疫局,西安 710068
Determination of Mercury in Coal by Oxygen Bomb Combustion-Atomic Fluorescence Spectrometry
王昌钊,吴双民,张遴
Shaanxi Entry–Exit Inspection and Quarantine Bureau, Xi'an 710068, China
摘要:建立氧弹燃烧-原子荧光光谱法测定煤中汞含量的方法。用氧弹燃烧分解样品,汞释放后以硝酸溶液吸收,以0.5 g/L 硼氢化钾溶液作为还原剂,体积分数5% 的硝酸溶液为载流液,用原子荧光光谱法定量测定。方法检出限为0.02 μg/kg,对标准物质GBW 11156(标准值0.32 μg/g)进行平行测定,测定结果的平均值为0.318 μg/g,相对标准偏差为7.3%(n=6),加标回收率为91.5%~106.5%。该方法简单、干扰少,准确度和精密度良好,可用于煤中汞的测定。
Abstract:The method for determination of mercury in coal was set up by oxygen bomb combustion-atomic fluorescence spectrometry. Mercury was absorbed by nitric acid solution when samples were combusted and decomposed by oxygen bomb, and quantitatively analyzed by atomic fluorescence spectrometry with 0.5 g/L KBH4 solution as the reducing agent and 5% HNO3 solution as the mobile phase. The detection limit was 0.02 μg/kg, the relative standard deviation of the results for 0.32 μg/g Hg was 7.3%(n=6), and the recovery was between 91.5% and 106.5%. This method is simple, less disturbant, accurate and precise, and it is suitable for the determination of mercury in coal.
关键词:煤;氧弹燃烧;原子荧光;汞
Keywords:coal; oxygen bomb combustion; AFS; Hg
本文引用格式:
王昌钊,吴双民,张遴.氧弹燃烧-原子荧光光谱法测定煤中汞含量[J].化学分析计量,2017,26(2):70-72.
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