Micelle Mediated Extraction of Iron and Its Determination in Geological, Geochemical, Hydrogeochemical, Biogeochemical and Process Solutions

Pranab Kumar Tarafder, Rabin Kumar Mondal

Regional Centre for Exploration and Research, AMDER/Department of Atomic Energy, Jamshedpur, India.

DOI: 10.4236/ajac.2012.35046                

Abstract

Iron irrespective of its valency states forms bluish 1:1 cationic, bluish-violet 1:3 neutral and purple 1:3 anionic complexes with 2,3-dihydroxynaphthalene, at pH 2 - 3, 4 - 5 and 8 - 10, respectively. The cationic bluish complex is highly insensitive and not extractable in organic solvents. Similarly, the bluish violet 1:3 neutral complex is of moderate sensitivity, and it is extractable in organic solvents with reduced sensitivity. The purple 1:3 anionic complex is as such not extractable in any organic solvents. However, in the surfactant medium of the cationic surfactant, cetyltrimethylammonium bromide it is extractable in organic solvents with enhanced sensitivity. The 1:3 anionic complex which is extractable in organic solvents as an ion associate in the presence of cetyltrimethyl ammonium bromide is chosen for application to Silicate rocks, Minerals, Soils, Stream sediments, Concentrates, Tobacco leaves, Cigarettes and Waters, for accurate and sensitive determination of iron owing to facile extraction of iron, enhanced sensitivity high selectivity and better reproducibility of results. The present paper describes a systematic study on the development of an extraction spectrophotometric method for the determination of iron in samples of diverse matrices.

Keywords

2, 3-Dihydroxynaphthalene; Cetyltrimethylammonium Ion; Spectrophotometric; Solvent Extraction; Determination

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	P. K. Tarafder and R. K. Mondal, “A Review on the Complex Forming Ability of O-O’ Type Ligands with Transition Metals: Introducing 2,3-Dihydroxynaphthalene as a Potential Analytical Reagent,” Reviews in Analytical Chemistry, Vol. 30, No. 2, 2011, pp. 73-81.
[2]	P. K. Tarafder and R. K. Mondal, “Liquid-Liquid Extraction and Spectrophotometric Determination of Mn(II) in Geochemical Samples,” Chemia Analityczna (War-saw), Vol. 49, 2004, pp. 251-260.
[3]	L. Sommer, “Analytical Absorption Spectrophotometry in the Visible and Ultraviolet,” Elsevier, Budapest, 1989.
[4]	V. Patrovsky, “2,3-Dihydroxynaphthalene as a Photo-metric Reagent for the Determination of Certain Metals,” Collection of Czechoslovak Chemical Communications, Vol. 35, 1970, pp. 1599-1604.
[5]	P. K. Tarafder and A. K. Sardana, “A Rapid Method for the Spectrophotometric Determination of Iron in Silicate Rocks,” Chemia Analityczna (Warsaw), Vol. 45, 2000, pp. 145-151.
[6]	A. I. Vogel, “A Text Book of Quantitative Chemical Analysis,” 15th Edition, Longman, Essex, 1989.
[7]	L. G. Sillen, “Some Graphical Methods for Determining Euilibrium Constants II. On ‘Curve-Fitting’ Methods for Two-Variable Data,” Acta Chemica Scandinavica, Vol. 10, 1956, pp. 185-202.