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Characterization of mercury - Humic acids interaction by potentiometric titration with a modified carbon paste mercury sensor

机译：用改进的碳糊汞传感器电位滴定表征汞与腐殖酸的相互作用。

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摘要

Stability constant for mercury binding by commercial and natural humic acids (HA) were determined using a new potentiometric mercury(H) sensor based on dithiosalicylic acid modified carbon paste electrode. The sensor present a high selective and sensitive response to mercury(H) ions, and a low detection limit of 1.8 x 10(-8) M. The potentiometric titrations curves of humic acids against mercury(H) ions were modeled. For 1.00 x 10(-7) to 3.00 x 10(-4) M mercury(H) ion concentration levels the results are consistent with the presence of two different binding sites in the humic acid macromolecule. The strongest binding sites (log K-1 ranging from 10.1 to 6.8) are probably due to interaction with carboxylic acid and amine groups in the molecule, whereas weakest binding sites (log K-1 ranging from 8.8 to 4.5) can be associated to phenolic groups.
机译：使用基于二硫水杨酸修饰的碳糊电极的新型电位汞（H）传感器，确定了商业和天然腐殖酸（HA）与汞结合的稳定性常数。该传感器对汞（H）离子具有较高的选择性和灵敏响应，并且检测限较低，为1.8 x 10（-8）M。腐殖酸对汞（H）离子的电位滴定曲线已建模。对于1.00 x 10（-7）至3.00 x 10（-4）M汞（H）离子浓度水平，结果与腐殖酸大分子中两个不同的结合位点的存在相一致。最强的结合位点（log K-1范围为10.1至6.8）可能是由于与分子中的羧酸和胺基相互作用，而最弱的结合位点（log K-1范围为8.8至4.5）可能与酚类有关组。

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