Extraction and Spectrophotometric Determination of Iron(III) with N-(o-methyl) Phenyl-N-Hydroxy-N1-(o´ -Methyl)Phenyl- Benzamidine Hydrochloride and Thiocyanate

Abstract

N-(o-methyl) phenyl-N-hydroxy-N^I-(o-methyl) phenyl-benzamidine

hydrochloride is proposed as a new reagent for selective extraction and

spectrophotometric determination of iron(III) in presence of thiocyanate.

The orange-red mixed complex is formed which is extractable into benzene.

The optimum acidity range for the extraction and spectrophotometric

determination of the complex is 0.25 M to 0.6M. Molar absorptivity and

Sandell's sensitivity of the complex at its λ_max (470nm) have been found

to be 11480 L mole^–1 cm^–1 and 0.0047 cm^–2 respectively. The system

obeys Beer's law in the range 0.4 ppm to 4 ppm and interference due to

the presence of a number of cations and anions have been studied and the

method is successfully applied to determine iron content in a number of

iron drugs, soil samples and iron ores.