Spectrophotometric Determination of Osmium (VIII) with o-bromophenylfluorone

Spectrophotometric determination of osmium(VIII) was accomplished with o-bromophenylfluorone (OBPF) in the presence of hexadecyltrimethylammonium chloride (CTAC). In the determination of osmium(VIII), Beer's law was obeyed in the range of 0.02-1.4 mu g mL(-1), with an effective molar absorption coefficient (at 562 nm) and relative standard deviation of 1.22 x 10(5) L mol(-1) cm(-1) and 0.44 % (n = 10), respectively.