Abstract
A selective and quantitative separation method of iron(III) from iron(II) is described. A reliable and rapid colorimetric procedure for iron(III) determination is evaluated. An accurate and sensitive atomic absorption procedure for the determination of Fe(II), Fe(III) or total iron is inferred. Iron(III) is completely and selectively separated by flotation as an iron-thiocyanate complex using an oleic acid surfactant in the 1.5-2.5 pH. N-Cyanoacylacetaldehyde hydrazone (CyAH) was successfully used as a flame buffer in eliminating the interference of foreign species in an atomic absorption
spectrometric (AAS) determination of iron. The mechanism of the releasing action is discussed. Moreover, the mechanism of flotation is suggested. Also, the procedure was applied to determine Fe(III) and Fe(II) added to natural- water samples after the selective separation of Fe(III) thiocyanate.
