Microbial transformation of structural and functional makeup of human - impacted riverine dissolved organic matter / Fangang Meng in Industrial & engineering chemistry research, Vol. 51 N° 17 (Mai 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 17 (Mai 2012) . - pp. 6212-6218 Titre : Microbial transformation of structural and functional makeup of human - impacted riverine dissolved organic matter Type de document : texte imprimé Auteurs : Fangang Meng, Auteur ; Guocheng Huang, Auteur ; Zengquan Li, Auteur Année de publication : 2012 Article en page(s) : pp. 6212-6218 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Organic matter Human Résumé : The aim of this study was to reveal the biotransformation of human-impacted riverine dissolved organic matter (DOM) using well-controlled bioassay tests, with a focus on the biodegradation of the structural and functional makeup. Results of three-dimensional fluorescence excitation-emission matrix with parallel factor analysis (EEM-PARAFAC) showed that humic substances derived from human activities (i.e., anthropogenic humic-like substances) were of higher biodegradation potentials than terrestrial and microbial humic-like substances. In addition, the biodegradation finally led to an increase of the percentage contribution of fluorescent DOM to the total DOM. Characterization by nuclear magnetic resonance (NMR) spectroscopy indicated that large amounts of the structural components of the DOM were removed within 3 h of biodegradation. Characterization by X-ray photoelectron spectroscopy (XPS) further revealed that the riverine DOM contained various functional groups that underwent different biotransformation mechanisms. The XPS data also indicated the appearance of newly generated, oxygen-rich functional groups upon biodegradation and the disappearance of nitrogen-containing groups as a result of hydrolysis and nitrification of organic and/or ammonium nitrogen. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25862981 [article] Microbial transformation of structural and functional makeup of human - impacted riverine dissolved organic matter [texte imprimé] / Fangang Meng, Auteur ; Guocheng Huang, Auteur ; Zengquan Li, Auteur . - 2012 . - pp. 6212-6218. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 17 (Mai 2012) . - pp. 6212-6218 Mots-clés : Organic matter Human Résumé : The aim of this study was to reveal the biotransformation of human-impacted riverine dissolved organic matter (DOM) using well-controlled bioassay tests, with a focus on the biodegradation of the structural and functional makeup. Results of three-dimensional fluorescence excitation-emission matrix with parallel factor analysis (EEM-PARAFAC) showed that humic substances derived from human activities (i.e., anthropogenic humic-like substances) were of higher biodegradation potentials than terrestrial and microbial humic-like substances. In addition, the biodegradation finally led to an increase of the percentage contribution of fluorescent DOM to the total DOM. Characterization by nuclear magnetic resonance (NMR) spectroscopy indicated that large amounts of the structural components of the DOM were removed within 3 h of biodegradation. Characterization by X-ray photoelectron spectroscopy (XPS) further revealed that the riverine DOM contained various functional groups that underwent different biotransformation mechanisms. The XPS data also indicated the appearance of newly generated, oxygen-rich functional groups upon biodegradation and the disappearance of nitrogen-containing groups as a result of hydrolysis and nitrification of organic and/or ammonium nitrogen. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25862981

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