Análise de iodato em sais de cozinha

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.