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原文传递 Remediation and Stabilization of Soils Contaminated by Lead Resulting from the Removal of Paint From Bridges.

题名：	Remediation and Stabilization of Soils Contaminated by Lead Resulting from the Removal of Paint From Bridges.
作者：	banks, m. k. schwab, a. p.
关键词：	weathering, peeling, highway bridges, phytoremediation, immobilization, remediation, recommendations
摘要：	Lead-based paints are commonly used for painting steel bridge structures. Soils in the immediate vicinity of older bridges have been contaminated with Pb as a result of normal weathering and peeling of the paint coupled with removal prior to repainting. The objectives of this project were to assess the extent of lead contamination near highway bridges and to evaluate phytoremediation and immobilization as means of remediation. We examined soils in the vicinity of approximately 20 bridges in Indiana that had been repainted recently and were know to have been painted originally with Pb-based paint. We found only three bridges in which the extensive areas of soil were contaminated by Pb in concentrations greater than 400 mg/kg. Two of these sites were used for this project. In the field study, soluble phosphate was added to the soil and transformations of Pb were monitored using chemical extractants. Simultaneously, sunflowers were grown in the field to test the feasibility of phytoextraction for these conditions. Phosphate additions were effective in significantly reducing bioaccessible Pb, but the sunflowers were unable to remove Pb from the soils. A laboratory study using columns of contaminated demonstrated the very low mobility of Pb in soils. The recommendation from this study is that the immediate vicinity of recently painted bridges be tested for Pb in the soils. Elevated concentrations can be treated with soluble phosphate to reduce bioavailability of Pb. / NOTE: Final rept. / Supplementary Notes: Sponsored by Indiana Dept. of Transportation, Indianapolis. and Federal Highway Administration, Indianapolis, IN. Indiana Div. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA.
总页数：	u0814；35p
报告类型：	科技报告