Flow-injection analysis with the iron-induced perbromate-iodide reaction: spectrophotometric determination of iron.

Total iron is determined by a flow-injection spectrophotometric technique. The production of I(-)(3) from the iron(II)- or iron(III)-induced perbromate-iodide reaction is monitored at 353 nm. Calibration graphs are linear from 10 to 100 ng/ml with correlations up to 0.9998 and can be extended up to 10 microg/ml by appropriate adjustment of conditions. The average sampling rate is 30 samples/hr. Detection limits and relative standard deviations compare well with those of other FIA methods.