Determination of thallium in wine by electrothermal atomic absorption spectrometry after extraction preconcentration
Determination of thallium in wine by electrothermal atomic absorption spectrometry after extraction preconcentration
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DOI：
10.1016/s0584-8547(02)00032-0
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发表时间：
2002-06-28
影响因子：
3.3
通讯作者：
Stafilov, T
中科院分区：
文献类型：
--
作者：
Cvetkovic, J;Arpadjan, S;Stafilov, T
提出了一种用萃取-原子吸收光谱法测定葡萄酒中铊的简便方法.葡萄酒样品用硝酸和过氧化氢的混合溶液分解，铊的两种形态Tl（I）和Tl（I）从0.5mol I-1 KI溶液中被异丁基甲基酮（IBMK）萃取。对于两种不同的仪器：Perkin Elmer Zeeman 3030（HGA 600）和Varian SpectrAA-880（GTA-100），定义了萃取的碘化物络合物的ETAAS测量的最佳参数。研究了酒石酸、Pd [四氯钯酸铵（II）]或Ag（硝酸银）改性剂对Tl的碘化物络合物等极易挥发物质的热稳定作用。开发的分析方法允许50倍的预浓缩和测定0.05 μ l（-1）铊在葡萄酒中。葡萄酒中铊浓度范围为0.2-1 μ g l（-1）的相对标准偏差为6 - 12%。(C)2002 Eisevier Science B. V.保留所有权利。
A simple method for extraction electrothermal atomic absorption spectroscopy (ETAAS) determination of Tl in wine is described. The wine sample is decomposed with a mixture of nitric acid and hydrogen peroxide and both thallium species Tl(I) and Tl(I) are extracted from 0.5 mol I-1 KI solution into iso-butyl methyl ketone (IBMK). Optimal parameters for ETAAS measurement of the iodide complexes extracted were defined for two different instruments: Perkin Elmer Zeeman 3030 (HGA 600) and Varian SpectrAA-880 (GTA-100). Modifiers of tartaric acid, Pd [ammoniumtetrachloropaladate (II)] or Ag (silver nitrate) were investigated for thermal stabilization of such extremely volatile species as iodide complexes of Tl. The analytical procedure developed permits 50-fold preconcentration and determination of 0.05 mug l(-1) Tl in wine. The relative standard deviation ranges from 6 to 12% for the concentration range 0.2-1 mug l(-1) Tl in wine. (C) 2002 EIsevier Science B.V. All rights reserved.