E-viri
Recenzirano
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da Silva, Mateus Guimarães; Garcia, Kaio Gráculo Vieira; Mattos, Adriano Lincoln Albuquerque; Perez, Edier Humberto; da Silva Ma; de Aquino Sousa, Luis Felipe Rodrigues; da Costa Pinto, Antônio Marcos
Water, air, and soil pollution, 02/2023, Letnik: 234, Številka: 2Journal Article
Biosorption is a technique that uses materials of biological origin to accumulate contaminants and represents an alternative for the treatment of soils contaminated by heavy metals. In our study, we analyzed the bioavailability of Cd.sup.2+ and Pb.sup.2+ in an Alfisol after the application of sisal residues (Agave sisalana) and related the adsorption of these ions with the characteristics of the residues. In a greenhouse experiment, we exposed the Sorghum bicolor plants to different types (mucilage (MUC), fibrils (FIB), and fiber dust (FD)) and levels of residues of sisal (0.0, 0.5, 1.0, 2.0, and 3.0% w/w) for 60 days. The application of FIB and MUC residues in the soil was able to reduce by up to 40% the available levels of Cd.sup.2+ and Pb.sup.2+ in the soil solution, regardless of the applied dose. In addition to the lower levels and accumulations of Cd in the roots and shoots, the application of residues increased dry mass of the plants. On the other hand, plants grown in soil contaminated by Pb.sup.2+ and which received application of the residues did not show symptoms of phytotoxicity; this is justified by the lower content and accumulation of Pb.sup.2+ in the plants that had a translocation factor < 1. Cd.sup.2+ was strongly correlated with all lignocellulosic parameters, while Pb.sup.2+ showed a lower correlation. Our results suggest that the application of residues decreases the availability of Cd.sup.2+ and Pb.sup.2+ in the soil solution, alleviates phytotoxicity, and maximizes the development of Sorghum bicolor.
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