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Nitric Oxide Sorption by Calcareous Soils: II. Effect of Moisture on Capacity, Rate, and Sorption Products
Author(s) -
Miyamoto S.,
Prather R. J.,
Bohn H. L.
Publication year - 1974
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1974.03615995003800010025x
Subject(s) - sorption , soil water , moisture , chemistry , calcareous , humidity , environmental chemistry , water content , relative humidity , nitrate , soil science , environmental science , geology , adsorption , paleontology , physics , geotechnical engineering , organic chemistry , thermodynamics
At room temperature, the nitric oxide (NO) sorption capacity of calcareous soils increased with the presence of moisture in an air + NO stream (1.5% NO by volume) and/or in the soils. The largest increase, up to 10‐fold or approximately to the acid‐titratable basicity of soils, occurred when NO and H 2 O were sorbed simultaneously by initially dry soils from a moist air (humidity > 95%) + NO stream. The sorption rates were proportional to the unused portion of the capacity with the rate constants ranging from 0.02 to 0.03 min ‐1 for NO and 0.01 to 0.015 min ‐1 for H 2 O under simultaneous sorption. Initially moist soils sorbed NO from a dry air (humidity < 5%) + NO stream until the soils dried. The rate of NO sorption slowed at initial soil water suctions less than approximately 1 bar. Sorbed NO was recovered as nitrate and reacted with the basicity in moist soils. Less than 20% of the sorbed nitrogen was lost upon heating at 105C for 24 hours.