J. Phys. IV France
Volume 107, May 2003
Page(s) 13 - 20

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

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.

© EDP Sciences 2003