Applicability and Reliability of Gel-Filtration to Study Aquatic Humic Substances Revisited - the Effects of Ph on Molecular-Size Distributions

P.J. Shaw, H. De Haan, R.I. Jones

    Research output: Contribution to journal/periodicalArticleScientificpeer-review

    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.
    Original languageEnglish
    Pages (from-to)753-764
    JournalEnvironmental technology
    Volume15
    Issue number8
    DOIs
    Publication statusPublished - 1994

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