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Development of a new analytical method for extractive spectrophotometric determination of Co(II) using 4-[({4-[n-(3-oxo- 1,2-oxazolidin-4-yl)carboximidoyl] phenyl}methylidene) amino]-1,2- oxazolidin-3-one (OOCPMAO) as a reagent.

R.S.Lokhande1, M.Jaywant, P.R.Bhiwandkar2*, K.N.Patankar Jain3

Cobalt is extracted quantitatively at pH 6.4 using 4-[({4-[N-(3-oxo-1,2- oxazolidin-4-yl)carboximidoyl] phenyl}methylidene) amino]-1,2-oxazolidin- 3-one (OOCPMAO) as a reagent. The absorption maxima was obtaind at 425 nm. The coloured complex was then extracted in chloroform and determined by spectrophotometer. The calibration plot was found between 1 to 10 ppm. The molar absorptivity of colored species was found to be 4.9359 X 103 Lit mol-1 cm-1 and the sensitivity of the method as defined by SandellÂ’s was 8.391 X 10-5 µg / cm2. The stability of complex was up to 72 hours. The composition of the extracted species was determined by using the JobÂ’s continuous variation method and verified by mole ratio method and slope ratiomethod, it was 1:2. The method has been applied to analysis of cobalt in superalloys, paints, varnishes, and inks. The result was competable with earlier known methods.