| Abstract: | A flow injection system is proposed for catalytic kinetic spectrophotometric determination of trace iron(II + III). The involved reaction is based on the catalytic effect of iron(III) on oxidation reaction of xylenol orange by potassium bromate to form a blue-violet complex. Iron(II) is also determined, being oxidized to iron(III) by potassium bromate. The calibration graph is linear in the range of 0.02–10.0 µg l?1 and 10.0–1100 µg l?1. The relative standard deviation is 1.5% for 4.0 µg l?1 iron(III) and 2.3% for 60.0µg l?1 iron(III) (n = 11). The presented system was applied successfully to the determination of iron in natural waters. |
