Abstract
The effects of various experimental conditions on the results obtained by using membrane filtration for the separation and fractionation of organic matter in fresh waters (mainly fulvic and humic substances) are described. The technique used (washing or concentration) and the initial concentration of the organic matter to be filtered are the most critical factors. The technique is used for the fractionation of eight water samples, one sample of peat interstitial water, five water extracts of soil and four water samples obtained by decomposition of leaves. The results are compared. A comparison is also made with results cited in the literature.
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