This paper describes a new method for flow injection analysis (FIA) determination of iodide at nanogram levels in water based on the catalytic destruction of the colour of Fe(III)-SCN~- -CP~+ (cetylpyridinium chloride) complex. The apparent molar absorptivity of the complex in terms of iodide is (6.90) x 10~5 l mole~(-1) cm~(-1) at a maximum absorption of 470 nm. The detection limit of the method is 0.1 ng I~- /ml. The FIA variables for the determination of iodide in the water were optimized. Sample throughput was 50 samples/h. The method is particularly useful for characterization of iodide at lower nanogram levels in rain, surface and ground water samples.
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