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TITRATIONS OF FULVIC ACID FRACTIONS II: CHEMICAL CHANGES AT HIGH PH
Author(s) -
DAVIS H.,
MOTT C. J. B.
Publication year - 1981
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.1365-2389.1981.tb01714.x
Subject(s) - alkali metal , chemistry , fraction (chemistry) , titration , polysaccharide , inorganic chemistry , mass fraction , hydroxylation , chromatography , organic chemistry , enzyme
Summary The stability in solution of a polycarboxylic acid fraction and a polysaccharide fraction of fulvic acid was investigated by pH stat titrations. At pH 8.0 alkali‐consuming reactions occurred on the polycarboxylic acid fraction. At pH 10.0, these alkali consuming reactions were continuing steadily after 22 days. It is suggested that hydroxylation of bound Al may contribute significantly to the consumption of alkali by the fraction. The data indicated that alkali consuming reactions occurred on the polysaccharide fraction at pH 10.0, but not at pH 9.0 and below. Evidence is discussed which indicates that a ‘peeling process’, by which end reducing sugars are stripped off polysaccharide chains and transformed to saccharinic acids, could account for the alkali consumption on this fraction.