Avaliação do nível de chumbo, em solo de várzea, proveniente da reciclagem de baterias

Abstract

Abstract Abstract Abstract: In order to characterize and to quantify the minerals of the clay fraction and to evaluate the contamination by lead (Pb) caused by effluents from a recycling company of waste batteries in Paula Freitas, Paraná state, Brazil , samples of low land soil were collected from five profiles. Besides the total levels, the soil samples were submitted to sequential chemical analyses for the determination of different Pb forms: soluble, exchangeable, linked to organic matter, linked to alluminiun and iron oxides and residual. The clay fraction, studied by X-ray diffraction and differential thermogravimetric analysis, presented high levels of kaolinite and small amounts of gibbsite, amorphous material and goethite.

Extrações sequenciais de chumbo e zinco em solos de área de mineração e metalurgia de metais pesados

“…Dessa forma, sugere-se que, ao longo da utilização do método, sejam acompanhadas as variações de massa das amostras para dar maior confiabilidade aos resultados, expressando-se os reais teores dos metais em cada fração do solo. Outros autores também tomaram o mesmo cuidado de controle de massa de amostras de argila em tratamentos sequenciais para Pb (Wowk & Melo, 2005) e para K e Mg (Melo et al, 2002(Melo et al, , 2003. .…”

Rapid tests for the toxicity evaluation of soil contaminated by leadacid batteries manufacture

“…The kinetics and the presence of heavy metals in the soil, mainly in old dumps, depends on the time of deposition of the residue, degradation and composition of the material, besides taking into account the climatic conditions and mineralogical compositions of the soil (Fontes & Gomes, 2003). The pH values also have a strong influence on the adsorption and mobility of heavy metals (Wowk & Melo, 2005), affecting the concentration in the soil solution. In acidic conditions, the adsorption is more significant in the control of the bioavailability of metals, whereas the solubility or precipitation and complexation reactions have a greater influence in neutral or alkaline conditions (Elliott et al, 1986).…”