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Biodegradation of hexachlorocyclohexane-isomers in contaminated soils [An article from: Soil Biology and Biochemistry]
Book Details
PublisherElsevier
ISBN / ASINB000PAA582
ISBN-13978B000PAA583
AvailabilityAvailable for download now
MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Soil Biology and Biochemistry, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
Several sites that are contaminated with isomers of the chlorinated insecticide hexachlorocyclohexane (HCH) are present across the globe and cause toxicity. For their bioremediation, we studied the degradation of HCH-isomers in contaminated soils by an isolate Pseudomonas aeruginosa ITRC-5. The degradation is optimal at 2mg technical-HCH (t-HCH)/g soil, 15% water content, pH 8.0, temperature 28^oC and inoculum density 10^6 colony forming unit/g soil. Under these conditions, from 5kg soil, >98% @a- and @c-HCH, 17% @b-HCH and 76% @d-HCH are degraded after 15 days of incubation, which is accompanied with the release of 600@mg chloride/mg t-HCH. Concomitant to the degradation, a four-fold reduction in the toxicity of HCH-isomers to earthworm, Eisenia foetida, is also observed. Addition of ITRC-5 enhanced the degradation of soil-applied HCH-isomers in 'open field' conditions as well, and 97%, 43%, 94% and 77% of @a-, @b-, @c- and @d-HCH, respectively, are degraded after 12 weeks of incubation. Thus, the bacterium causes microbial degradation and detoxification of HCH-isomers, and can be used for the bioremediation of contaminated soils.
Description:
Several sites that are contaminated with isomers of the chlorinated insecticide hexachlorocyclohexane (HCH) are present across the globe and cause toxicity. For their bioremediation, we studied the degradation of HCH-isomers in contaminated soils by an isolate Pseudomonas aeruginosa ITRC-5. The degradation is optimal at 2mg technical-HCH (t-HCH)/g soil, 15% water content, pH 8.0, temperature 28^oC and inoculum density 10^6 colony forming unit/g soil. Under these conditions, from 5kg soil, >98% @a- and @c-HCH, 17% @b-HCH and 76% @d-HCH are degraded after 15 days of incubation, which is accompanied with the release of 600@mg chloride/mg t-HCH. Concomitant to the degradation, a four-fold reduction in the toxicity of HCH-isomers to earthworm, Eisenia foetida, is also observed. Addition of ITRC-5 enhanced the degradation of soil-applied HCH-isomers in 'open field' conditions as well, and 97%, 43%, 94% and 77% of @a-, @b-, @c- and @d-HCH, respectively, are degraded after 12 weeks of incubation. Thus, the bacterium causes microbial degradation and detoxification of HCH-isomers, and can be used for the bioremediation of contaminated soils.
