Determinação de cobre, alumínio e ferro em solos derivados do basalto através de extrações seqüenciais

• Published in: Química nova Vol. 25; no. 4; pp. 548 - 552
• Main Authors: Costa, Antonio Carlos Saraiva da, Almeida, Vitor de Cinque, Lenzi, Ervim, Nozaki, Jorge
• Format: Journal Article
• Language: English
• Published: Sociedade Brasileira de Química 01.07.2002
• Subjects: atomic absorption spectrophotometry; basaltic soils; sequential extractions
• ISSN: 0100-4042; 1678-7064
• DOI: 10.1590/S0100-40422002000400007

Copper, aluminum and iron concentrations were determined in four geochemical fractions of three different basaltic soils from the northwest region of the Parana State, Brazil. The fractions examined were the reducible manganese dioxide and amorphous iron oxide, crystaline iron oxide, organic and residual. Metal concentrations were determined in the extracts by flame atomic absorption spectrophotometry. High Fe concentrations were extracted from the crystalline iron oxide (>20%), as well as the amorphous iron oxide (>12%). Copper was extracted from the amorphous and crystalline iron oxides in the range 5 to 12%, but low concentrations were bound to organic matter. Low concentrations of aluminum were extracted (<8%) from the amorphous and crystaline iron oxides, and organic matter. High concentrations of aluminum were found in the residual fraction.