Time-dependent changes in soluble organics, copper, nickel, and zinc from sludge amended soils

Journal Article · · J. Environ. Qual.; (United States)

OSTI ID:6990775

Dudley, L M; McNeal, B L; Baham, J E

An acidic western Washington soil and a near-neutral eastern Washington soil were each mixed with anaerobically digested Seattle-METRO sewage sludge and incubated in triplicate at 25 +/- 2/sup 0/C and approximately -33 kPa water potential for 1, 2, and 4 d and 1, 2, 4, 10 and 30 weeks. At the end of each incubation period, saturation pastes were made using 0.01 M CaCl/sub 2/ and vacuum extracted. Total soluble C, Cu, Ni and Zn, as well as NH/sub 4/ + NH/sub 3/, NO/sub 3/-N, ortho-P, and pH were measured in the extracts. High NH/sub 4/ + NH/sub 3/ values produced in the first 2 weeks of incubation caused the pH to increase into the alkaline range. Soluble C values increased during this period, and soluble Cu values increased despite the increasing pH, apparently because of organic complex formation. Soluble Zn declined during the same period. Soluble Ni possessed intermediate chemical behavior, as it appeared to be influenced both by a solid phase with pH dependent solubility and by ability to form organic complexes. Nitrification during incubations longer than 4 weeks led to a pH decline and increased Zn and Ni levels once more. Decreasing Cu levels were also associated with this period, likely due to losses of soluble organic materials via oxidation to CO/sub 2/.

• Research Organization: Washington State Univ., Pullman
• OSTI ID: 6990775
• Journal Information: J. Environ. Qual.; (United States), Journal Name: J. Environ. Qual.; (United States) Vol. 15:2; ISSN JEVQA
• Country of Publication: United States
• Language: English

Related Subjects

510200* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AMMONIUM COMPOUNDS
CARBON
CHEMICAL REACTIONS
CHEMISTRY
COMPARATIVE EVALUATIONS
COMPLEXES
COPPER
ELEMENTS
FEDERAL REGION X
METALS
NICKEL
NITRATES
NITRIFICATION
NITROGEN COMPOUNDS
NONMETALS
NORTH AMERICA
ORGANIC MATTER
OXYGEN COMPOUNDS
PH VALUE
SEWAGE
SEWAGE SLUDGE
SLUDGES
SOIL CHEMISTRY
SOILS
TRANSITION ELEMENTS
USA
WASHINGTON
WASTES
ZINC