Chemical speciation and determination of antimony with N,N '-diphenylbenzamidine and brilliant green in an acidic non-ionic micellar media

The individual forms of antimony, i.e. antimony (III), antimony (V) and tot al antimony in fresh ground mater and in industrial effluents hare been det ermined spectrophotometrically. The method is based on extraction of chloro antimonate (V) complex in 0.5-7.5 M HCl acid medium in the presence of a no n-ionic surfactant TX-100 with N,N'-diphenylbenzamidine (DPBA) in toluene a nd subsequent reaction of the extracts with brilliant green (BG) at 1.0-3.0 pH, The molar absorptivity of the Sb-V-Cl--(TX-100)-DPBA/-BG complex in to luene is 1.83 x 10(5) dm(3) mol(-1) cm(-1) at 640 nm. The detection limit o f the method is 10 ppb.