In the present paper we studied the complexation capacity towards copper ion of fulvic acids extracted from Arno River and Lake Como sediments, as well as Antarctic Sea water at different pHs in order to evaluate the interaction of different complexing groups of fulvic acids with copper ions. The binding capacity studies were carried out by means of titration with a copper-selective electrode and calorimetric measurements. For the same purpose, the heat of reaction in the complexation of copper ions with small molecules containing functional groups similar to fulvic acid was also determined. Titration results indicated that the fraction of bound metal increases with increasing pH (from 5 to 7). This may be accounted for by the increase in the ionisation of the fulvic acid molecule. Results obtained from calorimetric measurements show that the quantity of total heat involved in the metal ion-fulvate interactions determines a decreasing exothermic response with increasing pH values.

Calorimetric investigation about the complex formation of some humic compounds / Antonelli, Marta Letizia; N., Calace; C., Fortini; Petronio, Bianca Maria; M., Pietroletti; P., Pusceddu. - In: JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY. - ISSN 1388-6150. - STAMPA. - 70:(2002), pp. 291-297.

Calorimetric investigation about the complex formation of some humic compounds

ANTONELLI, Marta Letizia;PETRONIO, Bianca Maria;
2002

Abstract

In the present paper we studied the complexation capacity towards copper ion of fulvic acids extracted from Arno River and Lake Como sediments, as well as Antarctic Sea water at different pHs in order to evaluate the interaction of different complexing groups of fulvic acids with copper ions. The binding capacity studies were carried out by means of titration with a copper-selective electrode and calorimetric measurements. For the same purpose, the heat of reaction in the complexation of copper ions with small molecules containing functional groups similar to fulvic acid was also determined. Titration results indicated that the fraction of bound metal increases with increasing pH (from 5 to 7). This may be accounted for by the increase in the ionisation of the fulvic acid molecule. Results obtained from calorimetric measurements show that the quantity of total heat involved in the metal ion-fulvate interactions determines a decreasing exothermic response with increasing pH values.
2002
01 Pubblicazione su rivista::01a Articolo in rivista
Calorimetric investigation about the complex formation of some humic compounds / Antonelli, Marta Letizia; N., Calace; C., Fortini; Petronio, Bianca Maria; M., Pietroletti; P., Pusceddu. - In: JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY. - ISSN 1388-6150. - STAMPA. - 70:(2002), pp. 291-297.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/254680
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