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Effects of zero-valent iron (Fe^0) and temperature on the transformation of DDT and its metabolites in lake sediment [An article from: Chemosphere]
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Effects of zero-valent iron (Fe^0) and temperature on the transformation of DDT and its metabolites in lake sediment [An article from: Chemosphere] | Digital

by T. Eggen (Author), A. Majcherczyk (Author)

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Binding:  Digital
Publisher:  Elsevier


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This digital document is a journal article from Chemosphere, published by Elsevier in . 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: Zero-valent iron improves the transformation of DDT [1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane] and its metabolites in aged and highly contaminated lake sediment under biotic conditions. The addition of Fe^0 has a strong effect on transformation rates at 22^oC and 9^oC, the most enhanced degradation being obtained for DDT and DDOH [2,2-bis(p-chlorophenyl)ethanol]. At 22^oC and 10 weeks' incubation, the DDT concentration is reduced from 2.75@mmolg^-^1 (974mgkg^-^1) to 0.98@mmol g^-^1 (346mgkg^-^1) and 1.98@mmolg^-^1 (702mgkg^-^1) in samples with and without the addition of iron, respectively. After 40 weeks' incubation these concentrations have further decreased to 0.19@mmolg^-^1 (66mgkg^-^1) and 0.74@mmolg^-^1 (264mgkg^-^1).There is no significant transformation of any of the compounds at 9^oC without the addition of Fe^0. In the presence of iron, however, DDT is reduced to 1.25@mmolg^-^1 (442mgkg^-^1) within 40 weeks' incubation. This study demonstrates the ability of adapted microorganisms to transform DDT under elevated temperatures in original, aged sediments, and also the stimulating effect of zero-valent iron, which is significant even at low temperatures.
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