R ESU M OAtualmente, é considerável o interesse no desenvolvimento de estratégias que sejam eficientes e duráveis na remediação de solos contaminados com metais pesados. Objetivou-se, com este trabalho, avaliar o desenvolvimento de duas espécies Eucalyptus urophylla e Eucalyptus saligna, cultivadas em substrato contaminado com Mn coletado em área próxima ao Porto de Itaguaí e ao local de disposição de resíduo perigoso da Cia Mercantil e Industrial Ingá em Itaguaí, RJ. O substrato foi tratado com dois resíduos industriais, um com característica alcalina (escória de aciaria) e outro com alto teor de óxido de ferro (carepa de laminação). Verificou se que o substrato não tratado apresentava alto teor de Mn nas frações fitodisponíveis, valores esses tóxicos para as espécies estudadas. Os tratamentos causaram redução nas concentrações de Mn em solução e trocável (frações fitodisponiveis) e aumento nas fases mais estáveis. A menor dose de Escória de Aciaria foi suficiente para que ocorresse diminuição nas concentrações de Mn em solução, sendo este efeito evidenciado pelo desenvolvimento das plantas e na maior dose de Escória de Aciaria o crescimento das espécies estudadas foi maior. O Eucalyptus urophylla apresentou maior desenvolvimento e maior extração deste elemento. Palavras chave: fitorremediação, árvores, metais pesadosPerformance of two eucalyptus species in soil with high levels of Mn A B ST R A C T Currently, there is considerable interest in developing strategies that are efficient and durable in the remediation of soils contaminated with heavy metals. This study aimed to evaluate the development of Eucalyptus urophylla and Eucalyptus saligna grown in contaminated substrate with Mn collected in the area near the Port of Itaguaí and location of disposal of hazardous waste of Cia Mercantil and Industrial Inga in Itaguaí. The substrate was treated with two industrial waste, with a characteristic alkaline (slag of melt shop) and another with high content of iron oxide (lamination of scale). It was found that the untreated substrate, had a high content of Mn in fractions phytoavailable, being these values toxic to the species. The treatments caused a reduction in the concentrations of Mn in solution and exchangeable (fractions phytoavailable) and increase in more stable phases. The lowest dose of slay of melt shop was enough to decrease the concentrations of Mn in solution, and this effect is evidenced by the development of plants and in the higher dose of slay of melt shop the growth of studied species was more. Eucalyptus urophylla showed greater development and greater extraction of this element.
The most abundant and critical elements in residues from well drilling and prospecting are barium and sodium. Ecotoxicological tests have been used to evaluate the toxicity caused by toxic substances present in the soil. The objective of the present study was to verify the effect of the application of drilling residue from oil wells on Oligochaeta activity. After incubation of the soil with residue doses -BaSO 4 and NaCl -three ecotoxicological tests were performed in which the species Eisenia andrei was used as a bioindicator. The avoidance behavior test showed that there was a negative effect of the application of the residue at a dose of 234 t ha -1 on Oligochaeta activity. However, the application of BaSO 4 alone did not show damage to the earthworms, unlike what was observed for NaCl application. These results indicate that sodium was the element that most restricted the activity of these organisms.
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