Abstract
This paper describes the cryoscopic determination of the dissociation-corrected number-average molecular weights −MN corr of fulvic acid samples isolated from soil and water. The soil and water fulvic acid samples originated, respectively, from the B 2 horizon of a Podzol soil (Conway, New Hampshire, U.S.A.) and the Oyster River (Lee, New Hampshire, U.S.A.). The corrections for dissociation of fulvic acid were determined by a theory which utilizes the equivalents per gram and the acid dissociation constants of the fulvic acid samples. The soil and aquatic fulvic acid −MN corr values are 644 and 626, respectively. The results are additional evidence for the similarity of humic materials isolated from soil and water. The importance of simultaneous experiments on soil and water humic material is emphasized.
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