title: Kinetic spectrophotometric determination of Fe(II) in the presence of Fe(III) by H-point standard addition method in mixed micellar medium.
abstract: The H-point standard addition method was applied to kinetic data for simultaneous determination of Fe(II) and Fe(III) or selective determination of Fe(II) in the presence of Fe(III). The method is based on the difference in the rate of complex formation between iron in two different oxidation states and methylthymol blue (MTB) at pH 3.5 in mixed cetyltrimethylammonium bromide (CTAB) and Triton X-100 micellar medium. Fe(II) can be determined in the range 0.25-2.5 microg ml(-1) with satisfactory accuracy and precision in the presence of excess Fe(III) and other metal ions that rapidly form complexes with MTB under working condition. The proposed method was successfully applied to the simultaneous determination of Fe(II) and Fe(III) or selective determination of Fe(II) in the presence of Fe(III) in spiked real environmental and synthetic samples with complex composition.
authors.affiliation: Department of Chemistry, Bu-Ali Sina University, Hamadan, Iran. hasani@basu.ac.ir
authors.forename: Masoumeh
authors.initials: M
authors.lastname: Hasani
authors.forename: Alireza
authors.initials: A
authors.lastname: Rezaei
authors.forename: Hamid
authors.initials: H
authors.lastname: Abdollahi
mesh_terms: D002623:Chemistry Techniques, Analytical / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000032:analysis*; D007700:Kinetics; D008823:Micelles; D015203:Reproducibility of Results; D013053:Spectrophotometry; D013997:Time Factors; D014867:Water / Q000032:analysis
chemical_list: D008823:Micelles; D014867:Water; D007501:Iron