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Abstract

The industrial sites, which deal with the production and/or use of cyanide in the processes often have contamination problems by cyanide in soils and water. The behaviour of these hazardous compounds in soil and the interactions with soil components are mostly unknown. In this work we studied the behaviour of the ferricyanide/ferrocyanide redox couple, chosen as the indicator of redox system in absence and in presence of humic fraction at nominal molecular weight lower than 5 kDa (HSL(mw)) extracted from a surface horizon of a Hamplumbret soil. Results obtained showed that ferrocyanide-HSL(mw) complexes were more stable than the parent Fe-CN ones. These complexes underwent electrochemical processes involving a slow homogeneous chemical reaction preceding the electron transfer step and causing their kinetic control (CE processes). In addition, the values of conditional formation constants of FeIICN and FeIIICN humate complexes were about three orders greater than the parent FeCN ones.

Additional information

Authors: LEITA L, Experimental Institute for Plant Nutrition, Gorizia (IT);MORI A, Experimental Institute for Plant Nutrition, Gorizia (IT);CORSO G, Experimental Institute for Plant Nutrition, Gorizia (IT);DE NOBILI M, University of Udine, Department of Crop Production and Agricultural Technology, Udine (IT);FRANCO I, University of Udine, Department of Crop Production and Agricultural Technology, Udine (IT);CENCI R M, JRC, Environment Institute, Ispra (IT)
Bibliographic Reference: An article published in: Soil and Sediment Contamination, Vol.10, No.5 (2001), pp.483-496
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