Abstract

Ravi Kumar Kakitha¹, Shyamala Pulipaka^1* and Deva Hari Puranam^1,2

DOI : http://dx.doi.org/10.13005/ojc/360622

A new preconcentration method which utilises a mixture of cationic and anionic surfactants for separation and spectrophotometric determination of iron and cobalt simultaneously has been developed. Themetal ions, iron and cobalt were complexed with thiocyante. The hydrophobic complexes of iron and cobalt were then extracted into catanionic mixed micelles of cetyltrimethylammonium bromide (CTAB) and sodium dodecyl sulphate (SDS). Different parameters like concentration of HCl, concentration of thiocyanate, concentrations of the surfactants (CTAB and SDS), equilibration temperature and time were studied to get maximum efficiency. The linear ranges of Fe3+ and Co2+ were found to be 0.139 – 0.838 µg mL–1 and 5.89 – 35.4 µg mL–1, respectively; thedetection limits obtained were 1.54 ng mL–1 and 6.18 ng mL–1. The developed procedure has been employed for the retrieval of Fe3+ and Co2+ in watersamples successfully(tap water and sea water). 98 – 107% recoveries were obtained.

Cloud Point Extraction; Catanionic Mixed Micelles; Iron And Cobalt

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