Environmental Pollution, Feb, 2013, Vol.173, p.168(8)
To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.envpol.2012.09.027 Byline: Fredrick Orori Kengara (a)(b), Ulrike Doerfler (a), Gerhard Welzl (c), Bernhard Ruth (a), Jean Charles Munch (a), Reiner Schroll (a) Abstract: The aim of the study was to induce and enhance the degradation of hexachlorobenzene (HCB), a highly-chlorinated persistent organic pollutant, in two ecologically different tropical soils: a paddy soil (PS) and a non-paddy soil (FS). The degradation of HCB was enhanced using two anaerobic-aerobic cycles in model laboratory experiments. There was greater degradation of HCB in the PS (half-life of 224 days) relative to the FS (half-life of 286 days). It was further shown that soils amended with compost had higher metabolite concentrations relative to the non-amended soils. In the first cycle, there was little degradation of HCB in both soils. However, in the second cycle, there was enhanced mineralization in the PS under aerobic conditions, with the compost-treated samples showing higher mineralization. There was also extensive volatilization in both soils. The metabolite pattern revealed that the increased mineralization and volatilization was due to the formation of lower chlorinated benzenes. Author Affiliation: (a) Helmholtz Zentrum Munchen, German Research Center for Environmental Health (GmbH), Institute of Soil Ecology, 85764 Neuherberg, Germany (b) Department of Chemistry, Maseno University, Private Bag Maseno, Kenya (c) Helmholtz Zentrum Munchen, German Research Center for Environmental Health (GmbH), Institute of Developmental Genetics, 85764 Neuherberg, Germany Article History: Received 19 July 2012; Revised 13 September 2012; Accepted 19 September 2012
Benzene -- Analysis ; Persistent Organic Pollutants -- Analysis ; Metabolites -- Analysis ; Clay Soils -- Analysis ; Soil Ecology -- Analysis
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