Applicability and reliability of gel filtration to study aquatic humic substances revisited; the effects of pH on molecular size distributions
Applicability and reliability of gel filtration to study aquatic humic substances revisited; the effects of pH on molecular size distributions
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.
gel filtration, gel chromatograms, humic substances, ph
753-764
Shaw, Peter J.
935dfebf-9fb6-483c-86da-a21dba8c1989
De Haan, Henk
bde49bc5-b4fe-4dfc-8c83-7f6a6a652254
Jones, Rodger I.
7a2e7099-517d-4e0f-bdfe-407504d0ef7c
August 1994
Shaw, Peter J.
935dfebf-9fb6-483c-86da-a21dba8c1989
De Haan, Henk
bde49bc5-b4fe-4dfc-8c83-7f6a6a652254
Jones, Rodger I.
7a2e7099-517d-4e0f-bdfe-407504d0ef7c
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), .
(doi:10.1080/09593339409385481).
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.
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Published date: August 1994
Keywords:
gel filtration, gel chromatograms, humic substances, ph
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Local EPrints ID: 75748
URI: http://eprints.soton.ac.uk/id/eprint/75748
ISSN: 0959-3330
PURE UUID: 63ecc971-08c6-45b4-b78d-97863d129aed
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Date deposited: 11 Mar 2010
Last modified: 14 Mar 2024 02:37
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Author:
Henk De Haan
Author:
Rodger I. Jones
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