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首页> 外文期刊>Electroanalysis >Kinetics and mechanism of Ni(II) chelation in model and real solutions of xylem sap of Quercus ilex
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Kinetics and mechanism of Ni(II) chelation in model and real solutions of xylem sap of Quercus ilex

机译：Ni（II）螯合的动力学和机理在栎栎木质部汁液的模型和实际溶液中

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摘要

The kinetics of formation and dissociation of Ni(II) complexes with oxalic and citric acids was studied by cyclic voltammetry in model solutions of xylem sap of Q. ilex (the dominant tree growing on serpentine soils of Northeast Portugal) using representative concentrations, pH and ionic strength. The role of magnesium on complex formation was analyzed from solutions where Mg is present at concentration levels found in the xylem sap of Q. ilex growing on both nonserpentine and serpentine soils. Kinetics studies were also done in diluted solutions of real xylem sap samples, spiked with increasing amounts of magnesium. The values obtained for the apparent rate constants were those anticipated by the proposed model. To test the validity of the methodology and mechanisms, formation rate constants, k(f) (M-1 s(-1)) of Ni(II) complexes with citrate and oxalate were evaluated that compare with the values from Eigen mechanism.
机译：利用循环伏安法，在具有代表性浓度，pH和离子强度。从溶液中分析了镁在复合物形成中的作用，在溶液中，Mg以在非蛇纹石和蛇纹石土壤上生长的Q. ilex木质部汁液中的浓度水平存在。还在木质素树液样品的稀释溶液中进行了动力学研究，样品中掺入了越来越多的镁。表观速率常数获得的值是拟议模型所预期的值。为了测试该方法和机理的有效性，对形成速率常数，Ni（II）与柠檬酸盐和草酸盐的配合物的k（f）（M-1 s（-1））进行了评估，并将其与本征机理的值进行了比较。

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