pH dependence of binding benzohquinoline and humic acid and effects on fluorescence quenching

Hsieh, P-C, Hsu, S-H, Lee, C-L and Brimblecombe, P (2010) pH dependence of binding benzohquinoline and humic acid and effects on fluorescence quenching. Environmental Toxicology and Chemistry, 29 (8). pp. 1696-1702. ISSN 1552-8618

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Abstract

The binding constant (KDOC) between humic acid and the nitrogen-containing polycyclic aromatic compound (N-PAC), benzo[h]quinoline, was measured at varying pH levels using fluorescence quenching (FQ). Because fluorescence characteristics of benzo[h]quinoline change with pH, determination required two optimum sets of excitation and emission wavelength pairs. A simple mixing model was used to eliminate the inherent fluorescence interference between benzo[h]quinoline and its protonated form, benzo[h]quinolinium, when estimating binding constants. Hydrophobic interaction is likely to control the binding between humic acid and benzo[h]quinoline and benzo[h]quinolinium, in lower and higher pH ranges (pH

Item Type: Article
Faculty \ School: Faculty of Science > School of Environmental Sciences
University of East Anglia > Faculty of Science > Research Groups > Marine and Atmospheric Sciences
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Depositing User: Rosie Cullington
Date Deposited: 03 Feb 2011 15:46
Last Modified: 25 Jul 2018 04:23
URI: https://ueaeprints.uea.ac.uk/id/eprint/20313
DOI: 10.1002/etc.220

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