Differential pulse polarography (DPP) was used to assess the interaction of Pb²⁺ with various humic acid analogs and several humic acids. DPP analysis demonstrated that the reduction peak maximum (E_p) for Pb²⁺ shifted to more negative values in the presence of humic acids and humic acid analogs. The observed E_p for Pb²⁺ in the presence of humic acids and humic acid analogs is influenced by ligand concentration, solution pH and Pb²⁺ concentration. Shifts in the E_p for Pb²⁺ are related to the reduction potential and can be rationalized using the Lingane equation.

中文翻译：

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腐殖酸及其类似物对铅的络合：伏安法研究

差分脉冲极谱法（DPP）用于评估Pb ²⁺与各种腐殖酸类似物和几种腐殖酸的相互作用。DPP分析表明，在存在腐殖酸和腐殖酸类似物的情况下，Pb ^2+的最大还原峰（E _p）移至更多的负值。在腐殖酸和腐殖酸类似物存在下，观察到的Pb ^2+的E _p受配体浓度，溶液pH和Pb ²⁺浓度的影响。Pb ²⁺的E _p的变化与还原电位有关，可以使用Lingane方程进行合理化。