Solvent extraction of Fe(III) by dehydrated castor oil fatty acids.

Fatibello-Filho, O; Bumba, M A; Trofino, J C; Neves, E A

Fatibello-Filho, O; Bumba, M A; Trofino, J C; Neves, E A.

Afiliação

Fatibello-Filho O; Universidade Federal de São Carlos, Departamento de Quimica, C.P. 676, CEP 13560, São Carlos, Est. São Paulo, Brazil.

Talanta ; 37(12): 1179-82, 1990 Dec.

Article em En | MEDLINE | ID: mdl-18965092

RESUMO

The effect of temperature on the extraction of FE(III) by dehydrated castor oil fatty acids (DCOFA) has been studied in the temperature range 283-313 K at 1.0M constant ionic strength (NaClO(4)). The temperature dependence of the conditional constant of extraction is given in the form: ln K(ext)=31.95 - 12800(1/T). Also, it was found that the average thermodynamic parameters, DeltaH degrees (ext), DeltaG degrees (ext), and DeltaS degrees (ext) are 106.5 kJ/mole, 27.3 kJ/mole, and 0.3 kJ. mole(-1).K(-1), respectively. The extracted species in toluene solution were identified as FeR(3).HR and Fe(OH)R(2), where HR represents the fatty acid used.

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Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Talanta Ano de publicação: 1990 Tipo de documento: Article País de afiliação: Brasil País de publicação: Holanda

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