Nitric oxide sorption by calcareous soils. II. Effect of moisture on capacity, rate, and sorption products
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/sub 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/sup -1/ for NO and 0.01 to 0.015 min/sup -1/ for H/sub 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. 8 references, 6 figures, 3 tables.
- Research Organization:
- Univ. of Arizona, Tucson
- OSTI ID:
- 5305976
- Journal Information:
- Soil Sci. Soc. Am. J.; (United States), Journal Name: Soil Sci. Soc. Am. J.; (United States) Vol. 38; ISSN SSSJD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Terrestrial-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION
ALKALINE EARTH METALS
CALCIUM
CHALCOGENIDES
CHEMISTRY
ELEMENTS
ENVIRONMENTAL TRANSPORT
HUMIDITY
MASS TRANSFER
METALS
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
POLLUTION
RESPONSE MODIFYING FACTORS
SOIL CHEMISTRY
SOILS
SORPTION