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| Pires,Ana Christina Duarte; Melo,Vander de Freitas; Lima,Valmiqui Costa; Motta,Antônio Carlos Vargas. |
| The aim of this work was to evaluate the mineralogical and chemical characteristics of most representative soils of the Region of Curitiba, Paraná State. Samples were collected at different depths. The results showed: (a) the quartz was the only identified mineral at the silt and sand fractions. The dominant clay mineral was Kaolinite, with contents ranging from 676.7 to 820.8 g kg-1. The gibbsite was also an important constituent of the most weathered horizons and the hematite and goethite contents were low, mainly in the Histosol; (b) at the C horizon of the Inceptisol, high intensity of vermiculite/smectite reflections were detected (X-ray diffraction), justifying the high capacity of expansion and contraction, normally showed for this soil horizon; (c)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Kaolinite; Crystalline and amorphous Fe and Al oxides; 2:1 minerals; XRD. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000200001 |
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| Pires,Ana Christina Duarte; Melo,Vander de Freitas; Motta,Antônio Carlos Vargas; Lima,Valmiqui Costa. |
| The interaction between heavy metals and soil constituents is one of the most important factors influencing the potential for ground water pollution. To study Pb behavior, samples of soils were incubated with a salt solution containing this metal. The experimental units consisted of plastic bags, partially opened with 0.1 dm³ of soil with three replications. After incubation, samples were subjected to sequential and selective extractions. Lead retention, measured by the maximum adsorption capacity of the soil, was relatively high with values ranging from 6,439 to 22,148 mg kg-1. The sequential and selective extractions showed that Pb adsorption was stable where the metal was found mainly in organic matter, Fe and Al oxides, and residual forms (specific... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Humic fraction; Fe and Al oxides; Sequential extraction procedure; Specific adsorption. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000200002 |
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