Iodate can be reduced in solution buffer B-R pH 2,0 by means of hydroxylamine. Depending on the concentration of the reducing agent, it is possible to generate molecular iodine or the triiodide complex. Iodine presents a set of three absorption peaks, whereas the complex only two in the ultraviolet region. Using hydroxylamine excess it is possible to monitor the triiodide in λ max. 352 nm e λ max. 288 nm. Employing the best experimental conditions, linear calibration curves between 2,3x10-4 mol L-1 to 5,0x10-4 mol L-1 were obtained for the determination of iodate. The methodology was applied in table salt samples from supermarkets of the city of Natal, RN.
iodate; triiodide; hydroxylamine
