DETERMINATION OF COPPER UNITED TO THE FRACTION OF FULVIC ACIDS AN ANDISOL SOIL FROM CAUCA BY VOLTAMPEROMETRY
COBRE UNIDO A ÁCIDOS FÚLVICOS
Abstract
The Cu2+ bound to the fraction of fulvic acids was evaluated by voltammetry, finding that 1% of the total Cu2+ is bound to said fraction, indicating a potential risk for environmental contamination, due to its high solubility in the entire pH range.
For its study, the humus fractions of an Andisol soil from the Department of Cauca were isolated, its fraction of fulvic acids was extracted by means of a granulometric method and successive extractions with basic solutions. Its purification was carried out through XAD-16 amberlite adsorption resins, Rexyn101-H exchange and dialysis membranes. It was characterized by spectroscopic techniques, E4 / E6 ratio, total acidity and molecular exclusion chromatography through sephadex G-75.
The carboxylic groups were the predominant ionizable fraction compared to the phenolic and alcoholic groups. Two fractions were obtained through the sephadex: one corresponding to molecules with a molecular weight greater than 50,000 daltons and another that comprises molecules with a molecular size in a range of 1,000 to 50,000 daltons.
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