Selenium mobility in irrigated soil columns as affected by organic carbon amendment

Journal Article · · Journal of Environmental Quality; (United States)

DOI:https://doi.org/10.2134/jeq1991.00472425002000040016x· OSTI ID:5912300

Neal, R H ^[1]; Sposito, G ^[2]

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1. Univ. of California, Riverside (United States)
2. Univ. of California, Berkeley (United States)

Samples of two agricultural soil profiles were collected from the western San Joaquin Valley, CA, and packed into 1.5-m columns. The soils were leached sporadically over 9 wk with an aqueous solution containing selenate and subjected to two different chemical environments in order to investigate the effects of an added C source and intermittent irrigation of the fate of applied Se. Evaluation of the soluble Se present in the soil columns at the end of the leaching experiments showed the movement of Se to be retarded with respect to that of the leaching solution, and this was attributed to the effect of intermittent irrigation on the behavior of Se in the soil columns. Under control conditions, soluble Se was predominantly in the selenate form, whereas the inclusion of a C amendment results in the reduced total soluble Se in the upper portions of the columns and transformation to organically associated Se. Elevated concentrations of soluble Mn were found where selenate had transformed and organically associated Se, indicating the possibility of localized reduction processes.

• OSTI ID: 5912300
• Journal Information: Journal of Environmental Quality; (United States), Journal Name: Journal of Environmental Quality; (United States) Vol. 20:4; ISSN JEVQA; ISSN 0047-2425
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540220* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
CALIFORNIA
CARBON COMPOUNDS
CHEMISTRY
DEVELOPED COUNTRIES
DISSOLUTION
ELEMENTS
ENVIRONMENTAL TRANSPORT
LEACHING
MANGANESE
MASS TRANSFER
METALS
NORTH AMERICA
SELENIUM
SEMIMETALS
SEPARATION PROCESSES
SOIL CHEMISTRY
SOILS
SOLUBILITY
TRANSITION ELEMENTS
USA