Determinação de bromato em melhoradores de farinha por cromatografia de troca iônica com detecção espectrofotométrica

Abstract

Recebido em 5/7/04; aceito em 5/11/04; publicado na web em 28/2/05 BROMATE DETERMINATION IN FLOUR IMPROVERS BY ION EXCHANGE CHROMATOGRAPHY WITH SPECTROPHOTOMETRIC DETECTION. KBrO 3 is registered by the FAO/OMS as a genotoxic and carcinogenic compound. In spite of this, KBrO 3 is still employed by Brazilian bakeries. Nowadays ion exchange chromatography (IEC) is the most rapid and trustful method for BrO 3 analysis. When at high concentrations, chloride ions can interfere in the BrO 3 analysis, if the detection is performed by electrical conductivity. On the other hand, spectrophotometric detection, presented here is based on the absorption of BrO 3 in the ultraviolet region (210 -230 nm) where the absortion of chloride ions is very low, thus making possible the qualitative and quantitative analysis of BrO 3 in flour improver samples.