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Applied and Environmental Soil Science
Volume 2012 (2012), Article ID 721032, 7 pages
http://dx.doi.org/10.1155/2012/721032
Research Article

Comparative Use of Soil Organic and Inorganic Amendments in Heavy Metals Stabilization

Department of Fertility and Fertilizers, University of Buenos Aires, Avenue San Martín 4453, 1417 Buenos Aires, Argentina

Received 21 October 2011; Revised 20 January 2012; Accepted 25 January 2012

Academic Editor: Giancarlo Renella

Copyright © 2012 Agustina Branzini and Marta Susana Zubillaga. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Remediation strategies are capable to mitigate negative effects of heavy metals (HMs) on soils. The distribution of cooper (Cu), zinc (Zn), and chromium (Cr) was evaluated in a contaminated soil after adding biosolid compost (BC) and phosphate fertilizer (PF). A greenhouse assay and sequential extraction procedure were performed to determine the fractionation of HM in contaminated and remediated soil. In BC treatment, among 4 to 6% of Cu was associated with soil humic substances. Without amendments and with fertilizer application, Zn solubility increased by 15.4 and 8.4%, respectively, with experiment time. Although Cr was significantly adsorbed to the inorganic fraction, with compost application there was a transfer to organic fraction. A single amendment application is not suitable for immobilizing all metals of concern, because there are diverse union’s behaviors between HM and soil matrix. As the organic matter and phosphate fertilizer were effective in reducing mobility of Cu, the organic matter was more effective in the immobilization of Cr, and inorganic amendment induced the Zn precipitation, results from this pilot study suggest a combined use of these two amendments for soil remediation strategies. However, liming may be further needed to prevent soil acidification on longer time scales. Also, we propose the use of chemical and biological remediation strategies for potential improvement of effectiveness.