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Elimination Of Double Peaks In The Iodimetric Flow Injection Visible Spectrophotometric Determination Of Sulphite Using A Single-Channel Manifold, Julian Tyson, A. G. Fogg, X. Wang
Elimination Of Double Peaks In The Iodimetric Flow Injection Visible Spectrophotometric Determination Of Sulphite Using A Single-Channel Manifold, Julian Tyson, A. G. Fogg, X. Wang
Chemistry Department Faculty Publication Series
A flow injection method of determining sulphite with amperometric monitoring of iodine using a single-channel manifold in which iodine is formed in the reverse flow injection (rFI) manner and reacts with sulphite dispersing in the normal flow injection (nFI) manner has been adapted for use with visible spectrophotometry. The carrier stream consists of an alkaline solution containing iodate and an excess of iodide: injections of acid and then of acidified sulphite are made. The decrease in the iodine signal (measured at 352 nm) in the presence of sulphite is proportional to the sulphite concentration in the injectate. The alkalinity of …
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
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 …