Applicability and reliability of gel filtration to study aquatic humic substances revisited; the effects of pH on molecular size distributions


Shaw, Peter J., De Haan, Henk and Jones, Rodger I. (1994) Applicability and reliability of gel filtration to study aquatic humic substances revisited; the effects of pH on molecular size distributions. Environmental Technology, 15, (8), 753-764. (doi:10.1080/09593339409385481).

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Description/Abstract

The effect of pH on the molecular size distribution of dissolved humic substances (DHS) in surface waters from four different lakes in northern Europe was studied using Sephadex G-100 gel filtration chromatography (GFC). New methods for the analysis of the elution profiles obtained are introduced, employing parallel graphical and statistical approaches. For all samples investigated, the proportion of the DHS eluted in the excluded fraction tended to diminish with decreasing pH. At the same time, the remaining DHS eluted tended to decrease in apparent molecular size with decreasing pH. Analyses of the elution profiles revealed that the apparent conformational flexibility of the DHS in the samples was greatest for the samples of lowest ionic strength. The applicability and reliability of GFC as a tool for the investigation of aquatic humic substances are discussed.

Item Type: Article
ISSNs: 0959-3330 (print)
1479-487X (electronic)
Keywords: gel filtration, gel chromatograms, humic substances, ph
Subjects: T Technology > TD Environmental technology. Sanitary engineering
Q Science > QD Chemistry
Divisions: University Structure - Pre August 2011 > School of Civil Engineering and the Environment
ePrint ID: 75748
Date Deposited: 11 Mar 2010
Last Modified: 27 Mar 2014 18:54
URI: http://eprints.soton.ac.uk/id/eprint/75748

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