Isomer-specific biodegradation of nonylphenol in river sediments and structure-biodegradability relationship

Environmental Science & Technology
Zhijiang Lu, Jay Gan

Abstract

Nonylphenol (NP), a well-known environmental estrogen with numerous isomers, is frequently found in surface water and sediments. Recent studies showed that NP isomers exhibited different estrogenicity. However, at present little information is available on its isomer-specific degradation in the bed sediment, which is the primary sink of NP in surface aquatic systems. In this study, we investigated the biodegradability of 19 NP isomers in two river sediments under oxic and anoxic conditions. Under oxic conditions, the half-lives of NP isomers in an upper river sediment ranged from 0.9 to 13.2 d. Under reduced conditions, the persistence of NP isomers generally increased, with negligible dissipation under strongly reduced conditions. In the well-aerated sediment, NP isomers with short side chain and/or bulky α-substituents were found to be more recalcitrant to degradation. Moreover, when a total of 57 molecular descriptors were examined, the degree of branching as quantified by IDWbar was found to result in the best linear correlation with half-lives of NP isomers (R(2) = 0.88). These results indicated that the isomer-specificity of NP in environmental processes should be considered, and that simple molecular descriptors may be u...Continue Reading

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Citations

Sep 16, 2014·Environment International·Zhijiang Lu, Jay Gan
Mar 30, 2016·Journal of Hazardous Materials·Elena KoumakiConstantinos Noutsopoulos
Dec 31, 2014·Environmental Science and Pollution Research International·Alessando CareghiniElena Sezenna
Nov 26, 2014·Applied Microbiology and Biotechnology·Zhao WangShuguang Xie
Jul 16, 2017·Environmental Science and Pollution Research International·Lingdan YaoLiping Lou
Jun 23, 2020·The Science of the Total Environment·Dennis EckelmannChristopher Leake
Feb 6, 2017·Journal of Agricultural and Food Chemistry·Klaus GüntherRoswitha Böhme

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