Resumen

KHAYATIAN, Gholamreza; HASSANPOOR, Shahed; NASIRI, Farough  y  ZOLALI, Amin. Preconcentration, determination and speciation of iron by solid-phase extraction using dimethyl (E)-2-[(Z)-1-acetyl)-2-hydroxy-1-propenyl]-2-butenedioate. Quím. Nova [online]. 2012, vol.35, n.3, pp. 535-540. ISSN 0100-4042.  http://dx.doi.org/10.1590/S0100-40422012000300018.

A new sensitive and selective procedure for speciation of trace dissolved Fe(III) and Fe(II), using modified octadecyl silica membrane disks and determination by flame atomic absorption spectrometry was developed. A ML₃ complex is formed between the ligand and Fe(III) responsible for extraction of metal ion on the disk. Various factors influencing the separation of iron were investigated and the optimized operation conditions were established. Under optimum conditions, an enrichment factor of 166 was obtained for Fe³⁺ ions. The calibration graph using the preconcentration system for Fe³⁺ was linear between 40.0 and 1000.0 μg L^-1.

Palabras llave : speciation; iron; solid-phase extraction.