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Molecular size of aquatic humic substances

January 1, 1982

Aquatic humic substances, which account for 30 to 50% of the organic carbon in water, are a principal component of aquatic organic matter. The molecular size of aquatic humic substances, determined by small-angle X-ray scattering, varies from 4.7 to 33 A?? in their radius of gyration, corresponding to a molecular weight range of 500 to greater than 10,000. The aquatic fulvic acid fraction contains substances with molecular weights ranging from 500 to 2000 and is monodisperse, whereas the aquatic humic acid fraction contains substances with molecular weights ranging from 1000 to greater than 10,000 and is generally polydisperse. ?? 1982.

Publication Year 1982
Title Molecular size of aquatic humic substances
Authors E. M. Thurman, R. L. Wershaw, R. L. Malcolm, D. J. Pinckney
Publication Type Article
Publication Subtype Journal Article
Series Title Organic Geochemistry
Index ID 70011801
Record Source USGS Publications Warehouse