Recovery and Distribution of Biosolids-Derived Trace metals in a Clay Loam Soil. (S11-sukkariyah259004-oral)
Authors:
B. Sukkariyah* - Va. Tech.
G. Evanylo - VA Tech L. Zelazny - VA Tech
Abstract:
The long-term mobility of trace metals has been cited as a potential hazard by critics of EPA 503 rule governing the land application of biosolids. The objectives of this study were to assess the accumulation of Cu, Ni, Cd, and Zn within the soil profile, the distribution of exchangeable, specifically adsorbed, organic and oxide fraction of each metals, and mass balance of Cu and Zn 17 years after biosolids application. Biosolids were applied to 1.5 x 2.3 m confined plots of a Davidson clay loam (Clayey, Kaolinitic, Thermic, Rhodic Paleudult) in 1984 at 0, 42, 84, 126, 168, and 210 Mg/ha. The highest biosolids application supplied 4.5, 750, 43, and 600 kg/ha of Cd, Cu, Ni, and Zn, respectively. Soils were sampled to a depth of 0.9 m and sectioned into 5 cm increment. Total (EPA 3050B), bioavailable (Mehlich-I), and sequential extraction of metals were performed. The results showed no apparent movement of the metals below the root zone. Metals concentrated in the top 0.2 m with slight
enrichment down to 0.3 m. Mass balance calculation showed that > 90% of Cu and Zn applied are still found in the topsoil where sludge were incorporated. Sequential extraction analysis showed that the amended plots have much higher concentration of bioavailable metals than the control.
Speaker Information: Beshr Sukkariyah, Va. Tech., 609 broce Drive, Blacksburg, VA 24060; Phone:
540-953-1612; E-mail: [email protected]
Session Information: Tuesday, November 4, 2003, 8:10 AM-11:00 AM Presentation Start: 8:10 AM
