Flow injection analysis spectrophotometric speciation of iron in rain, fog, dust and soil samples

S.G. Aggarwal

doi:doi:10.1051/jp4:20030232

Issue		J. Phys. IV France Volume 107, May 2003


Page(s)		13 - 20
DOI		https://doi.org/10.1051/jp4:20030232

J. Phys. IV France 107 (2003) 13
DOI: 10.1051/jp4:20030232

Flow injection analysis spectrophotometric speciation of iron in rain, fog, dust and soil samples

S.G. Aggarwal

School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur (CG), India

Abstract
A new attempt for the flow injection analysis (FIA) spectrophotometric speciation of iron in various enviromnental samples is described. The method is based on conventional iron-thiocyanate colour reaction. In this work, oxidation of Fe(II) into Fe(III) is carried out with HNO ₃ solution in the flowing stream and total iron present in the sample is measured. Whereas, Fe(III) is measured with a mixed solution of HCl+H ₂SO ₄. The presence of cationic (CPC) and non-ionic (TX-100) surfactants remarkably enhances the sensitivity ( $\approx$ 3 fold) of the automated conventional method and make the method applicable for the speciation of iron in real samples (rain, fog) containing the metal in lower ppb levels.