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Characterization of humins from different natural sources and the effect on microbial reductive dechlorination of pentachlorophenol.

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Title: Characterization of humins from different natural sources and the effect on microbial reductive dechlorination of pentachlorophenol.
Authors: Zhang, Chunfang1,2, Zhang, Dongdong3, Xiao, Zhixing3, Li, Zhiling2, Suzuki, Daisuke2, Katayama, Arata2,3 a-katayama@esi.nagoya-u.ac.jp
Source: Chemosphere. Jul2015, Vol. 131, p110-116. 7p.
Subjects: Humins, Pentachlorophenol, Herbicides, Chlorophenols, Spectrum analysis
Abstract: Humins have been reported to function as an electron mediator for microbial reducing reactions. However, the physicochemical properties and the functional moieties of humins from different natural sources have been poorly characterized. In this study, humins extracted from seven types of soil and from a river sediment were examined on the effect on microbial reductive dechlorination of pentachlorophenol (PCP) and characterized polyphasically. All humins facilitated microbial reductive dechlorination of PCP as electron mediators using formate as carbon source, with different dechlorination rates ranging from 0.99 to 7.63 (μmol Cl − ) L −1 d −1 . The highest rates were observed in humins with high carbon contents, extracted from Andisols containing allophone as major clay. Yields of the humins and the elemental compositions varied among sources. Fourier transform infrared analysis showed that all the humins exhibited similar spectra with different absorbance intensity; these data are indicative of their similar structures and identical classes of functional groups. The electron spin resonance spectra of humins prepared at different pH showed typical changes for the semiquinone-type radicals, suggestive of quinone moieties for the redox activity of the humins. Cyclic voltammetry analysis confirmed the presence of redox-active moieties in all the humins, with the estimated redox potentials in the range of −0.30 to −0.13 V (versus a standard hydrogen electrode), falling into the range of standard redox potential between the oxidation of formate as electron donor and the initial dechlorination of PCP as electron acceptor. [ABSTRACT FROM AUTHOR]
Copyright of Chemosphere is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 102318168
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PubType: Academic Journal
PubTypeId: academicJournal
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Characterization of humins from different natural sources and the effect on microbial reductive dechlorination of pentachlorophenol.
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  Data: <searchLink fieldCode="AR" term="%22Zhang%2C+Chunfang%22">Zhang, Chunfang</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Zhang%2C+Dongdong%22">Zhang, Dongdong</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Xiao%2C+Zhixing%22">Xiao, Zhixing</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Li%2C+Zhiling%22">Li, Zhiling</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Suzuki%2C+Daisuke%22">Suzuki, Daisuke</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Katayama%2C+Arata%22">Katayama, Arata</searchLink><relatesTo>2,3</relatesTo><i> a-katayama@esi.nagoya-u.ac.jp</i>
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  Data: <searchLink fieldCode="JN" term="%22Chemosphere%22">Chemosphere</searchLink>. Jul2015, Vol. 131, p110-116. 7p.
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  Data: <searchLink fieldCode="DE" term="%22Humins%22">Humins</searchLink><br /><searchLink fieldCode="DE" term="%22Pentachlorophenol%22">Pentachlorophenol</searchLink><br /><searchLink fieldCode="DE" term="%22Herbicides%22">Herbicides</searchLink><br /><searchLink fieldCode="DE" term="%22Chlorophenols%22">Chlorophenols</searchLink><br /><searchLink fieldCode="DE" term="%22Spectrum+analysis%22">Spectrum analysis</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Humins have been reported to function as an electron mediator for microbial reducing reactions. However, the physicochemical properties and the functional moieties of humins from different natural sources have been poorly characterized. In this study, humins extracted from seven types of soil and from a river sediment were examined on the effect on microbial reductive dechlorination of pentachlorophenol (PCP) and characterized polyphasically. All humins facilitated microbial reductive dechlorination of PCP as electron mediators using formate as carbon source, with different dechlorination rates ranging from 0.99 to 7.63 (μmol Cl − ) L −1 d −1 . The highest rates were observed in humins with high carbon contents, extracted from Andisols containing allophone as major clay. Yields of the humins and the elemental compositions varied among sources. Fourier transform infrared analysis showed that all the humins exhibited similar spectra with different absorbance intensity; these data are indicative of their similar structures and identical classes of functional groups. The electron spin resonance spectra of humins prepared at different pH showed typical changes for the semiquinone-type radicals, suggestive of quinone moieties for the redox activity of the humins. Cyclic voltammetry analysis confirmed the presence of redox-active moieties in all the humins, with the estimated redox potentials in the range of −0.30 to −0.13 V (versus a standard hydrogen electrode), falling into the range of standard redox potential between the oxidation of formate as electron donor and the initial dechlorination of PCP as electron acceptor. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Chemosphere is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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        Value: 10.1016/j.chemosphere.2015.02.043
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        Text: English
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      – SubjectFull: Humins
        Type: general
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      – SubjectFull: Herbicides
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      – SubjectFull: Chlorophenols
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      – SubjectFull: Spectrum analysis
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      – TitleFull: Characterization of humins from different natural sources and the effect on microbial reductive dechlorination of pentachlorophenol.
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              Text: Jul2015
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