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Recent developments in modern instrumentation and analytical techniques have put greater demands on the tradi-

Osmium(V1) reacts with excess 2,3-quinoxalinedithiol (QDT) in N, N'-dimethylformamide-water solutions acidified with hydrochloric acid to form a green complex with an absorption maximum at 560 nm. The color, which develops to maximum intensity within 1.5 hours, is stable for several hours. The system conforms to Beer's law. Optimum range for 1.00-cm optical path is 2 to 8 ppm of osmium, determined with a relative standard deviation of about 2%. The molar absorptivity at 560 nm is 1.73 X