Rapid spectrophotometric determination of cobalt after extraction using oximidobenzotetronic acid.
A spectrophotometric method based on the extraction of cobalt with benzene solutions of oximidobenzotetronic acid (OBTA) is proposed for the estimation of 0.2-3.0 ppm of cobalt. The 3:1 OBTA : Co complex containing cobalt(III) has its absorption maximum at 430 nm; its molar absorptivity in benzene is 1.82 x 10(3)L. mole(-1). mm(-1). Since the blue iron(II) complex is not extracted into benzene, iron(II) and cobalt(II) can be separated and determined spectrophotometrically.
Manku
G S
GS
Department of Chemistry University of Delhi Delhi-7, India.
Bhat
A N
AN
Jain
B D
BD