Determination of bromate in bread additives and flours by flow injection analysis

摘要

A new, simple, rapid and sensitive spectrophotometric flow injection analysis (FIA) method was developed for the determination of bromate based on its reaction with 3,5-dibromo-PADAP and thiocyanate in a strongly acidic medium. This produced an unstable violet product with a maximum absorption at 602 nm. The calibration curve was linear in the range of 2.00xl0~-6- 2.10xl0~5 mol/l and the detection limit was 8.00xl0~-7 mol/l. The sampling frequency was 90 h~-l. The method has been success- fully applied to the determination of bromate in commercial bread additives and flours.