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REACTIONS OF AMMONIA WITH SOIL II. SORPTION OF NH 3 ON ENGLISH SOILS AND ON WYOMING BENTONITE
Author(s) -
ASHWORTH J.
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.tb02050.x
Subject(s) - sorption , bentonite , soil water , chemistry , environmental chemistry , inorganic chemistry , soil science , geology , adsorption , organic chemistry , geotechnical engineering
Summary Sorption isotherms and heats of sorption of NH 3 gas on soils, Wyoming bentonite and silica gel were measured at 27 °C after preliminary drying at 22°‐290 °C. Sorption of NMe 3 was also measured on some of the materials. Sorption on soils was not very sensitive to change in drying temperature, even though soil water content was markedly affected. Sorption on bentonite was dependent on drying temperature because this affected ease of lamellar separation. The results suggest that under the conditions employed, NH 3 sorption on the English soils studied is predominantly due to its protonation at pH‐dependent charge sites and partly to co‐ordination with exchangeable Mg or Ca (but not Na or K). Sorption through mechanisms involving hydrogen bonding is apparently negligible.