Heavy Metal Availability in Soil Amended with Composted Urban Solid Wastes |
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Authors: | C P Jordão C C Nascentes P R Cecon R L F Fontes J L Pereira |
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Institution: | 1. Departamento de Solos, Universidade Federal de Vi?osa, Vi?osa, Minas Gerais, Brasil 2. Departamento de Química, Universidade Federal de Vi?osa, Vi?osa, Minas Gerais, Brasil 3. Departamento de Informática, Universidade Federal de Vi?osa, Vi?osa, Minas Gerais, Brasil
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Abstract: | A study was performed to evaluate the pH and the availability of Zn, Cu, Mn, Pb, and Ni in soil amended with increasing doses
of composted solid wastes, collected in Rio de Janeiro, Rio de Janeiro State and in Coimbra, Minas Gerais State, Brazil. The
influence of the time elapsed between compost application to the soil and the sampling of the plant growth substrate (soil
+ compost) for pH and metal availability analyses was also examined. The availability of heavy metals in the soil, in the
compost and in the substrate was evaluated using DTPA solution for metal extraction. The increase of the compost doses added
to the soil resulted in the increase of the pH in the substrate. The addition of the compost from the bigger city, Rio de
Janeiro, resulted in higher increase in soil pH and available Zn, Cu, Pb, and Ni levels as compared to the addition of the
compost from the smaller city, Coimbra. Increasing the time elapsed between the compost application to the soil and the sampling
of the mixture resulted in higher available Zn, Cu, Mn, and Pb levels. The addition of the compost from Rio de Janeiro resulted
in substrate metal concentrations in the order Zn > Pb > Ni > Cu > Mn and for the Coimbra compost the metal concentrations
in the substrate was Zn > Pb > Cu > Ni > Mn. The higher values of pH and available metals obtained for the bigger city were
attributed to the greatest metal contamination of its compost. |
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Keywords: | availability compost heavy metal soil solid urban waste |
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