Calculation of molecular weights of humic substances from colligative data: Application to aquatic humus and its molecular size fractions |
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Authors: | J.H. Reuter E.M. Perdue |
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Affiliation: | School of Geophysical Sciences, Georgia Institute of Technology, Atlanta, GA 30332, U.S.A.;Environmental Science/Chemistry Department, Portland State University, Portland, OR 97207, U.S.A. |
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Abstract: | A rigorous mathematical expression for the dependence of colligative properties on acid dissociation of water soluble humic substances is presented. New data for number average molecular weights of a river derived humic material and its gel permeation Chromatographic fractions are compared with values obtained by a reevaluation of previously published experimental observations on soil and water fulvic acids. The results reveal a remarkable similarity of fulvic acids from widely different sources with respect to number-average molecular weight. |
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