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Shapes Of Flow Injection Signals: Effect Of Refractive Index On Spectrophotometric Signals Obtained For On-Line Formation Of Bromine From Bromate, Bromide, And Hydrogen Ion In A Single-Channel Manifold Using Large-Volume Time-Based Injections, Julian Tyson, A. G. Fogg, E. Cipko, L. Farabella

Chemistry Department Faculty Publication Series

The shapes of the spectrophotometric signals obtained with a single-channel manifold for large-volume (4 ml) time-based injections for the six possible combinations of the reagents bromate, bromide and nitric acid in the injectate and carrier stream, by which bromine can be formed on-line, have been determined. The injectate and carrier stream were 5.25 x 10-4 M in bromate, 0.030 M in bromide and 1 M in nitric acid when these reagents were present. The signals consisted of two separate peaks caused by formation of bromine at the front and rear boundaries of the injected bolus. When both injectate and carrier …