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首页> 外文学位 >Metal speciation in model solutions and environmental aqueous samples by depletive stripping chronopotentiometry.
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Metal speciation in model solutions and environmental aqueous samples by depletive stripping chronopotentiometry.

机译：通过耗竭溶出计时电位法在模型溶液和环境水性样品中的金属形态。

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摘要

Depletive stripping chronopotentiometry (SCP), a new, recently developed electroanalytical technique, has been investigated and evaluated in terms of metal speciation in aqueous samples containing dissolved organic compound (DOC). The effect of stripping current on metal determination has been studied, as well as that of deposition time and stirring speed on diffusion layer thickness. At low stripping current and high stirring speed, depletive condition can be attained and linear diffusion may be approached at a Static Mercury Drop Electrode (SMDE). Scanned Stripping Chronopotentiometry (SSCP) has been applied to simple homogeneous complexes, e.g. cadmium and lead with pyridine-2, 6-dicarboxylic acid, nitrilo-triacetic acid and the stability constants have been validated by comparison with those obtained from Pseudopolarography (Scanned Stripping Voltammetry, SSV) under the same experimental conditions. The results determined by both techniques are in good agreement with the literature values. SSCP has been further exploited in metal complexation in the presence of heterogeneous fulvic acid (FA), a kind of humic substances which is one of the largest fractions of dissolved organic matter (DOM) in aquatic systems. The stability constants, heterogeneities and diffusion coefficients of complexes of Cd(II), Pb(II) and Zn(II) with FA have been determined by SSCP and Pseudopolarography for comparison. Besides, I pioneered efforts to apply SCP to real samples, in which the effect of dilution of Copper Cliff Mine effluent water samples (Sudbury, Ontario) with tap water on the average conditional stability constants of DOC of zinc and cadmium was investigated by complexometric titration followed by SCP. Compared with similar work reported in the literatures, the results of SCP are reasonable. Depletive stripping chronopotentiometry (SCP) may offer more reliable information on metal speciation compared with stripping voltammetry (SV) because of its elimination or reduction of secondary effects.
机译：耗竭溶出计时电位法（SCP）是一种新近开发的电分析技术，已针对含有溶解有机化合物（DOC）的水性样品中的金属形态进行了研究和评估。研究了剥离电流对金属测定的影响，以及沉积时间和搅拌速度对扩散层厚度的影响。在低汽提电流和高搅拌速度下，可以达到耗竭条件，并且可以在静态汞滴电极（SMDE）处达到线性扩散。扫描剥离计时电位法（SSCP）已应用于简单的均质复合物，例如通过与在相同实验条件下从伪极谱法（扫描溶出伏安法，SSV）获得的镉和铅以及吡啶-2、6-二羧酸，次氮基三乙酸和稳定常数进行了比较。通过两种技术确定的结果与文献值非常吻合。 SSCP已在存在异质黄腐酸（FA）的情况下进一步用于金属络合中，FA是一种腐殖质，是水生系统中最大的可溶性有机物（DOM）组分之一。用SSCP和伪极谱法测定了Cd（II），Pb（II）和Zn（II）与FA的配合物的稳定常数，非均质性和扩散系数，以进行比较。此外，我开创了将SCP应用于实际样品的工作，其中通过络合滴定法研究了用自来水稀释铜崖矿废水水样品（安大略省萨德伯里）对锌和镉DOC的平均条件稳定性常数的影响。随后是SCP。与文献报道的类似工作相比，SCP的结果是合理的。与溶出伏安法（SV）相比，耗竭溶出计时电位法（SCP）可以提供有关金属形态的更可靠信息，因为它可以消除或减少次级影响。

著录项

  • 作者

    Yang, Min.;

  • 作者单位

    Carleton University (Canada).;

  • 授予单位 Carleton University (Canada).;
  • 学科 Environmental Sciences.; Geochemistry.
  • 学位 M.Sc.
  • 年度 2006
  • 页码 121 p.
  • 总页数 121
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境科学基础理论;地质学;
  • 关键词

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