PMID: 11918025Mar 29, 2002Paper

Evidence for nonlinear binding of PAHs to dissolved humic acids

Environmental Science & Technology
Yael Laor, Menahem Rebhun

Abstract

Binding of pyrene, fluoranthene, and phenanthrene to dissolved humic acids (HA) was determined by the fluorescence quenching (FQ) and complexation-flocculation (CF) methods. Determinations by the CF method, using varying contaminant concentrations and a constant HA concentration, yielded nonlinear Freundlich-type isotherms (n = 0.65-0.84). Experiments using both the CF and the FQ methods with varying HA concentrations and a constant contaminant concentration yielded curved "Stern-Volmer"-type plots that also indicate nonlinear binding. These findings suggest that linear partitioning or site complexation in the presence of excess available sites cannot fully describe the interactions of hydrophobic compounds with dissolved humic material. Site-specific hydrophobic interactions at limited interior or external molecular surfaces may be considered.

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Citations

Oct 17, 2008·Environmental Science and Pollution Research International·Bo PanBaoshan Xing
Dec 25, 2003·Journal of Colloid and Interface Science·Yanmei ZhouHongxiao Tang
Jun 23, 2011·Environmental Science & Technology·Ke GaiDongsheng Wang
Jan 7, 2014·Environmental Science and Pollution Research International·Na PengWenying Lv
Mar 12, 2003·Environmental Toxicology and Chemistry·Jarkko Akkanen, Jussi V K Kukkonen
Feb 18, 2016·Environmental Science & Technology·Rui LiWeihua Song
Sep 20, 2008·Environmental Pollution·César PlazaAlfredo Polo
Sep 14, 2007·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Patchreenart SaparpakornSupa Hannongbua
Jun 16, 2017·Applied Spectroscopy·Ryan P FerrieBruce D Anderson
Sep 13, 2008·Luminescence : the Journal of Biological and Chemical Luminescence·Deepa Subbiah, Ashok Kumar Mishra
Aug 14, 2013·Chemistry, an Asian Journal·Yubing SunXiangke Wang
Dec 19, 2019·International Journal of Environmental Research and Public Health·Mei-Sheu ShiTing-Chien Chen
Feb 9, 2018·Environmental Science & Technology·Chao QinYanzheng Gao

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