Determination of BrO₃⁻ by Flow Injection Analysis with 5-Br-PADAP AND SCN⁻

Abstract

An original method is established to determine microamounts of BrO₃ ⁻ in KC10₃ by flow injection analysis. A cooperative reaction mechanism is also proposed based on the formation of a red-violet and metastable triatomic ion association 5-Br-PADAPH₂ ².BrO₃ ⁻. SCN⁻, which shows maximum absorbence at 550 nm. The method offers the advantages of simplicity, rapidity and sensitivity. Beer's law obeyed from 0.25 to 2.56μg/mL of BrO₃ ⁻, and 90 determinations per hour is permitted under optimized variables by a modified simplex method.

Key Words:

• Flow injection analysis
• 5-Br-PADAP
• Triatomic ion association
• reaction mechanism