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SURFACE CHEMISTRY OF THE HYDRANDEPTS AND ITS RELATION TO NITRATE ADSORPTION AS AFFECTED BY PROFILE DEPTH AND DEHYDRATION 1
Author(s) -
BALASUBRAMANIAN V.,
KANEHIRO Y.
Publication year - 1978
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.1365-2389.1978.tb02030.x
Subject(s) - chemistry , adsorption , hydrolysis , nitrate , inorganic chemistry , aluminosilicate , dehydration , organic matter , nuclear chemistry , organic chemistry , biochemistry , catalysis
Summary The pH 0 and ZPC of two Hydiandepts were determined by potentiomettic titiation in NaCl and by ion adsorption measurements from NH 4 NO 3 , respectively. The decrease of pH, pH 0 , and ZPC due to drying was explained by the hydrolysis reaction. Partial drying, high organic matter content, and low Al 2 O 3 concentration in the surface soil were responsible for its low pH, pH 0 and ZPC. The high pH 0 of subsoils was attributed to the presence of amorphous aluminosilicates and mixed polymeric gels of Fe(III) and A1 with high water content. The significant decrease of nitrate adsorption due to dehydration is discussed in relation to the change in pH, pH 0 , ZPC, and surface area on drying.