Role of free radicals in the binding of organochlorine pesticides and heavy metals with humic acid

The formation of soluble complexes between humic acid (HA) and γ-HCH or different metals (Ca, Cr, Mn, Fe, Co, Ni, Cu, Zn,Pb, Cd, As and Mg) was studied, along with any generation of free radicals by electron spin resonance spectroscopy. Free radical generation was noticed in case of interaction of h...

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Bibliographic Details
Published in:The Science of the total environment 1999-07, Vol.231 (2), p.125-133
Main Authors: Pandey, A.K, Pandey, S.D, Misra, V, Viswanathan, P.N
Format: Article
Language:English
Subjects:
Applied sciences
Biological and physicochemical properties of pollutants. Interaction in the soil
Earth sciences
Earth, ocean, space
Electron spin resonance spectroscopy
Engineering and environment geology. Geothermics
Exact sciences and technology
Free radical
Humic acid
Hyperfine splitting
Pollution
Pollution, environment geology
Soil and sediments pollution
Soluble complexes
γ-Hexachlorocyclohexane
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Summary:The formation of soluble complexes between humic acid (HA) and γ-HCH or different metals (Ca, Cr, Mn, Fe, Co, Ni, Cu, Zn,Pb, Cd, As and Mg) was studied, along with any generation of free radicals by electron spin resonance spectroscopy. Free radical generation was noticed in case of interaction of humic acid with γ-HCH, Cu and Cr. A hyperfine splitting pattern was noticed only in case of Mn. However, with Ca, Cd, Pb, As, Ni, Co, Zn and Fe, neither free radicals were generated nor hyperfine splitting was observed. The possible significance of free radicals in the binding of environmental pollutants with humic acid is discussed together with ecotoxicological implications.
ISSN:0048-9697
1879-1026
DOI:10.1016/S0048-9697(99)00090-X