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PROPERTIES OF THE YELLOW ORGANIC ACIDS OF NATURAL WATERS 1
Author(s) -
Ghassemi Masood,
Christman R. F.
Publication year - 1968
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1968.13.4.0583
Subject(s) - sephadex , size exclusion chromatography , chemistry , molecule , ionization , fraction (chemistry) , fulvic acid , filtration (mathematics) , chromatography , organic chemistry , ion , fertilizer , statistics , mathematics , humic acid , enzyme
Gel filtration profiles obtained from a variety of naturally colored waters indicate that color producing molecules are mostly in the apparent molecular weight range of 700–10,000 relative to dextrans. One fraction seems to have a molecular weight in excess of 50,000. The apparent size of the color molecules was found to be p H dependent, increasing as p H increases. Size increases are attributed to increased functional group ionization and a decrease in the adsorbability on Sephadex. The degree of association of color molecules with iron was also found to be pH dependent, being greater at both high and low p H than in the range of 7–8.