Agency Fact Sheet, Department of Corrections: IMMC, FY2008

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Agency Fact Sheet, Department of Corrections: IPI, FY2008

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Agency Fact Sheet, Department of Corrections: ISP, FY2008

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Agency Fact Sheet, Department of Corrections: MPCF, FY2008

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Agency Fact Sheet, Department of Corrections: NCCF, FY2008

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Agency Fact Sheet, Department of Corrections: NCF, FY2008

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Agency Fact Sheet, Department of Cultural Affairs, FY2008

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Agency Fact Sheet, Department of Economic Development, FY2008

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Agency Fact Sheet, Department of Education, FY2008

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Agency Fact Sheet, Department of Education (only), FY2008

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Agency Fact Sheet, Department of Ethics and Campaign Disclosure Board, FY2008

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Agency Fact Sheet, Department of Governor Office, FY2008

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Agency Fact Sheet, Department of Governor Office: Office only, FY2008

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Agency Fact Sheet, Department of Governor Office of Drug Control Policy, FY2008

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Lead and zinc in the structure of organic and mineral soil components

In addition to the more reactive forms, metals can occur in the structure of minerals, and the sum of all these forms defines their total contents in different soil fractions. The isomorphic substitution of heavy metals for example alters the dimensions of the unit cell and mineral size. This study proposed a method of chemical fractionation of heavy metals, using more powerful extraction methods, to remove the organic and different mineral phases completely. Soil samples were taken from eight soil profiles (0-10, 10-20 and 20-40 cm) in a Pb mining and metallurgy area in Adrianópolis, Paraná, Brazil. The Pb and Zn concentrations were determined in the following fractions (complete phase removal in each sequential extraction): exchangeable; carbonates; organic matter; amorphous and crystalline Fe oxides; Al oxide, amorphous aluminosilicates and kaolinite; and residual fractions. The complete removal of organic matter and mineral phases in sequential extractions resulted in low participation of residual forms of Pb and Zn in the total concentrations of these metals in the soils: there was lower association of metals with primary and 2:1 minerals and refractory oxides. The powerful methods used here allow an identification of the complete metal-mineral associations, such as the occurrence of Pb and Zn in the structure of the minerals. The higher incidence of Zn than Pb in the structure of Fe oxides, due to isomorphic substitution, was attributed to a smaller difference between the ionic radius of Zn2+ and Fe3+.