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首页> 外文期刊>Analytica chimica acta >The use of voltammetry for sorption studies of heavy metals on mineral surfaces in presence of the siderophore desferrioxamine B
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The use of voltammetry for sorption studies of heavy metals on mineral surfaces in presence of the siderophore desferrioxamine B

机译：伏安法在铁矿去铁胺B存在下对矿物表面重金属的吸附研究

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摘要

The influence of pH, ligand and solid concentration on the determination of dissolved heavy metals in homogeneous solution and in suspension with mineral phases by different voltammetric methods has been evaluated. Sorption studies were conducted with model systems that consisted of montmorillonite or goethite, the hydroxamate siderophore desferrioxamine B (DFOB) as complexing agent, and the heavy metals Zn or Cd. An in situ voltammetric method for the quantitative determination of the heavy metal ion concentration in solution was developped for these model systems. The measured Zn and Cd species included both the free metal ions and their soluble DFOB complexes. Metal ions bound to the mineral phases were not detected. The effect of the organic compound on the voltammetric response was estimated from reference measurements and taken into account for the calibration procedure. This method was useful for the investigation of both kinetics and thermodynamics of adsorption phenomena. Results obtained by using this voltammetric procedure were compared with those from conventional batch studies on sorption, where dissolved heavy metal concentrations were measured by atomic absorption spectrometry. (C) 1999 Elsevier Science B.V. All rights reserved. [References: 21]
机译：评估了pH，配体和固体浓度对通过不同的伏安法测定均相溶液和矿物相悬浮液中溶解重金属的影响。使用由蒙脱石或针铁矿，异羟肟酸酯铁氧体去铁胺B（DFOB）和重金属Zn或Cd组成的模型系统进行吸附研究。对于这些模型系统，开发了用于定量测定溶液中重金属离子浓度的原位伏安法。测得的Zn和Cd物质包括游离金属离子及其可溶性DFOB络合物。未检测到与矿物相结合的金属离子。根据参考测量值估算有机化合物对伏安响应的影响，并考虑到校准程序。该方法可用于研究吸附现象的动力学和热力学。将使用该伏安法获得的结果与常规吸附研究进行了比较，在常规吸附研究中，通过原子吸收光谱法测定了溶解的重金属浓度。 （C）1999 Elsevier Science B.V.保留所有权利。 [参考：21]

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