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Determination of conditional stability constants of metal-Trichoderma viride complexes by the potentiometric titration method

Sanna, Giovanna and Alberti, Guido and Castaldi, Paola and Melis, Pietro (2002) Determination of conditional stability constants of metal-Trichoderma viride complexes by the potentiometric titration method. Fresenius Environmental Bulletin, Vol. 11 (9B), p. 636-641. ISSN 1018-4619. Article.

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Abstract

In this paper the binding ability of functional groups present in the cell walls of an ubiquitous soil fungus, Trichoderma viride Pers.: Fr., towards some divalent heavy metals, Cd, Co, Cu, Pb and Zn, was studied. Processing the data from potentiometric titrations of T. viride by the McCallum, Midgley and Gran’s combined methods, the surface of the cell wall was characterised in terms of functional group total acidity, distinguishing among strong, weak and very weak acidity. The dissociation constant values of weak and very weak acid, pKa1 and pKa2, respectively, were graphically determined using the Henderson-Hasselbach equation. Titration data of T. viride in the presence of metal were processed with the Bjerrum’s method as adapted by Gregor for determining the conditional stability constants of metal complexes with synthetic polyelectrolytes in terms of log K1 and log K2. Here has been used for 1:1 and 1:2 metal-T. viride complexes, respectively.

Item Type:Article
ID Code:1505
Status:Published
Refereed:Yes
Uncontrolled Keywords:Heavy metals, fungi, Trichoderma viride, potentiometric titration
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/13 Chimica agraria
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze ambientali agrarie e biotecnologie agro-alimentari
Publisher:PSP - Parlar Scientific Publications
ISSN:1018-4619
Deposited On:18 Aug 2009 10:05

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