title: Solvent extraction of Fe(III) by dehydrated castor oil fatty acids.
abstract: 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.
authors.affiliation: Universidade Federal de São Carlos, Departamento de Quimica, C.P. 676, CEP 13560, São Carlos, Est. São Paulo, Brazil.
authors.forename: O
authors.initials: O
authors.lastname: Fatibello-Filho
authors.forename: M A
authors.initials: MA
authors.lastname: Bumba
authors.forename: J C
authors.initials: JC
authors.lastname: Trofino
authors.forename: E A
authors.initials: EA
authors.lastname: Neves