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A comparison of the structural characteristics of polymaleic acid and a soil fulvic acid
Author(s) -
SPITELLER M.,
SCHNITZER M.
Publication year - 1983
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1983.tb01053.x
Subject(s) - chemistry , fulvic acid , homogeneous , fluorescence , carbon 13 nmr , elemental analysis , solubility , environmental chemistry , nuclear chemistry , inorganic chemistry , stereochemistry , organic chemistry , humic acid , fertilizer , physics , quantum mechanics , thermodynamics
Summary The purpose of this investigation was to compare structural characteristics of PMA with those of FA in order to assess the suitability of PMA to serve as a model for FA. Chemical (elemental analyses, CO 2 H group determinations, increases in OCH 3 after methylation, oxidative degradation) and spectroscopic (visible, UV, fluorescence, IR, 13 CNMR, and ESR) methods were used for this purpose. While PMA was found to resemble FA in a number of characteristics (water solubility, rich in CO 2 H groups, dark brown colour), it significantly differed from FA in a number of respects (UV, fluorescence, 13 CNMR spectra as well in oxidation products). Compared to FA, PMA appeared to be better organized and more homogeneous at the molecular level, richer in olefinic structures and less aromatic. But the chemical structures of both PMA and FA remain largely unknown.