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首页> 外文期刊>International Journal of Electrochemical Science >Complex Formation of Copper(II) and Cadmium(II) with Pectin and Polygalacturonic Acid in Aqueous Solution. An ISE-H+ and ISE-Me2+ Electrochemical Study
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Complex Formation of Copper(II) and Cadmium(II) with Pectin and Polygalacturonic Acid in Aqueous Solution. An ISE-H+ and ISE-Me2+ Electrochemical Study

机译：铜（II）和镉（II）与果胶和聚半乳糖醛酸在水溶液中的络合形成。 ISE-H + 和ISE-Me 2 + 电化学研究

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The acid-base properties of pectin and its ability to complex with copper(II) or cadmium(II) werequantitatively determined in order to define the ability of this natural polyelectrolyte to sequester metal-1 + ions. Potentiometric measurements carried out at different ionic strengths (0.1 - 0.7 mol L , in Naionic medium) allowed us to define the acid-base properties of pectin together with the dependence ofthe protonation constants on ionic strength and to calculate the protonation constant at infinite dilution.The formation of complex species between pectin and copper(II) or cadmium(II) was investigated+ 2+ 2+ -1 potentiometrically (using H , Cu and Cd Ion Selective Electrodes, ISEs) in NaNO3 at 0.1 mol L atT = 25C. The results thus obtained showed the formation of ML and MLH species for both the pectin- 2+ 2+ Cu / Cd systems. The acid-base properties and the complexation capacity of a commercialpolygalacturonic acid with copper(II) and cadmium(II) ions were also investigated, polygalacturonicacid being the most abundant component of pectin. On the basis of the proposed complexation model,the abilities of pectin and polygalacturonic acid to sequester cadmium(II) and copper(II) ions wereevaluated at different pH values. The data obtained on the sequestration capacity of the two ligandsused here were compared with previous data for other polycarboxylic polymer systems, includingalginate, polyacrylate and polymethacrylates, under the same experimental conditions.
机译：为了确定这种天然聚电解质螯合金属1 +离子的能力，定量确定了果胶的酸碱性质及其与铜（II）或镉（II）络合的能力。在不同的离子强度下（在Naionic介质中，在0.1-0.7 mol L下）进行电位测量，可以定义果胶的酸碱性质，以及质子化常数对离子强度的依赖性，并可以计算无限稀释时的质子化常数。研究了果胶与铜（II）或镉（II）之间络合物物种的形成，在NaNO3中以0.1 mol L于T = 25C时用电位计+ 2+ 2+ -1（使用H，Cu和Cd离子选择性电极，ISEs）进行了研究。由此获得的结果表明，对于果胶-2+ 2+ Cu / Cd系统，ML和MLH物种的形成。还研究了市售聚半乳糖醛酸与铜（II）和镉（II）离子的酸碱性质和络合能力，其中聚半乳糖醛酸是果胶中含量最多的成分。在所提出的络合模型的基础上，评估了果胶和聚半乳糖醛酸在不同pH值下对螯合镉离子和铜离子的能力。在相同的实验条件下，将此处使用的两种配体的螯合能力获得的数据与其他多羧酸聚合物体系（包括藻酸盐，聚丙烯酸酯和聚甲基丙烯酸酯）的先前数据进行了比较。

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