2007
DOI: 10.1590/s0100-06832007000100015
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Cinética de solubilização de metais pesados por ácidos orgânicos em solos tratados com lodo de esgoto

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Cited by 8 publications
(3 citation statements)
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“…The factors under study consisted of two organic acids (citric acid and malic acid, both P.A. reagents), three ornamental rock residues (R1, R2 and R3) and five organic acid rates (0, 5, 10, 20 and 40 mmol L -1 ), established in accordance with the values found in the literature (Jones, 1998;Andrade et al, 2003;Pires and Mattiazzo, 2007;Corrêa et al, 2008). Samples containing 25 g of each rock residue were stored in plastic 500 mL bottles, and placed in contact with 250 mL of the organic acid solution at different concentrations and shaken on an orbital shaker for a period of 10 min at 175 rpm, and were then allowed to rest for the appropriate time interval for each extraction.…”
Section: Methodsmentioning
confidence: 82%
“…The factors under study consisted of two organic acids (citric acid and malic acid, both P.A. reagents), three ornamental rock residues (R1, R2 and R3) and five organic acid rates (0, 5, 10, 20 and 40 mmol L -1 ), established in accordance with the values found in the literature (Jones, 1998;Andrade et al, 2003;Pires and Mattiazzo, 2007;Corrêa et al, 2008). Samples containing 25 g of each rock residue were stored in plastic 500 mL bottles, and placed in contact with 250 mL of the organic acid solution at different concentrations and shaken on an orbital shaker for a period of 10 min at 175 rpm, and were then allowed to rest for the appropriate time interval for each extraction.…”
Section: Methodsmentioning
confidence: 82%
“…A estabilidade de complexação é dependente sobretudo da afinidade química entre o metal envolvido e o quelante, afinidade essa maior para os sintéticos (Martell & Smith, 1974). Para os quelantes orgânicos, a complexação é dependente do número e da proximidade dos grupos carboxílicos do ácido orgânico envolvido, do pH do solo e da concentração e do tipo de metal em questão (Pires & Mattiazzo, 2007). Com base na taxa de recuperação de Pb, pode-se obter a seguinte ordem na dessorção de Pb: EDTA > DTPA > NTA > Ácido Cítrico > Ácido Oxálico (Quadro 3).…”
Section: Resultados E Discussão Experimento I: Dessorção De Pb Promovunclassified
“…NaH 2 PO 4 (1,0 M, pH 5,0)As fortemente adsorvido Troca iônica do As com os íons PO 4 -3 .Ácidos orgânicos 0,1 M (acético 0,043 M, cítrico 0,031 M, lático 0,021, oxálico 0,005)As fortemente e fracamente adsorvido Troca iônica das formas de As mais lábeis e provenientes de sítios de adsorção mais específicos (PIRES;MATTIAZZO, 2007). Coelho, R.S.…”
unclassified