Aquatic Fulvic Acids: Chemical Characteristics and Complexation with Copper (II)

In this work we determined the quantity of fulvic acid functional groups and their interactions with copper(II) ions. The fulvic acids used were extracted from water collected from Itapanhau River, around the city of Cubatão, on the south coast of São Paulo state, southeast Brazil. The samples were...

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Bibliographic Details
Published in:	Journal of coastal research pp. 1069 - 1072
Main Authors:	Vaz, D.O., Isoppo, N., Szpoganicz, B.
Format:	Journal Article
Language:	English
Published:	Coastal Education & Research Foundation (CERF) 01-12-2006
Subjects:	Carboxylic acids Computer software Copper Functional groups Infrared spectroscopy Mathematical constants Molecules Phenols River water Titration
Online Access:	Get full text
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Summary:	In this work we determined the quantity of fulvic acid functional groups and their interactions with copper(II) ions. The fulvic acids used were extracted from water collected from Itapanhau River, around the city of Cubatão, on the south coast of São Paulo state, southeast Brazil. The samples were characterized by Elemental Analysis and Infrared Spectroscopy (FTIR) and the results indicated the major presence of carboxylic and phenolic groups. Determination of the quantity of carboxylic and phenolic groups was performed by potentiometric titration using a modified Gran's method and BEST7 software. With the BEST7 software, it was possible to determine, quantitatively (meq g⁻¹), two classes of carboxylic groups (carboxylic and phthalic) and two classes of phenolic groups (phenol and cathecol), and the combination of these groups (salicylic); as well as the protonation and complexation constants.
ISSN:	0749-0208 1551-5036