Behaviour of lead in a clayey soil treated with contaminated sewage sludge and its absorption by plants

• Autor(a) principal: Silva, Margarete Soares da
• Data de Publicação: 2008
• Outros Autores: Souza, Sílvia Naves de, Lenzi, Ervim, Luchese, Eduardo Bernardi
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Acta scientiarum. Technology (Online)
• Texto Completo: http://www.periodicos.uem.br/ojs/index.php/ActaSciTechnol/article/view/3018
• topic: lodo de esgoto; chumbo em plantas; chumbo em solo; metal pesado; 1.06.00.00-0 Química

In a clayey soil placed in PVC tubes (80cm high and 10cm in diameter) five treatments were applied with sewage sludge contaminated with Pb. Three with lead, in µg.g-1, at the concentrations of 0 (control); 2,500; 5,000, and two treatments with a mixture of lead + cadmium (as interferer), in µg.g-1 each, at the concentrations of 2,500 + 2,500 and 5,000 + 5,000 respectively. The soils in the tubes that received the treatment were cultivated with maize during two and a half months in a greenhouse. The soil analyses for the treatments showed heavy metal Pb only at the surface (from 0 to 20 cm depth). In the depth from 20 to 60 cm the concentration was steady showing a non-significant difference between the treatments and control. The Pb concentration interval found in the aerial parts of the plants (13 - 18 µg.g-1) for all the treatments was inferior to the interval values considered phytotoxic by the literature (30 - 300 µg.g-1). No interference of cadmium on lead behaviour was observed.