Automatic Liquid-Liquid Extraction Flow Injection Analysis Determination of Trace Amounts of Perchlorate with Spectrophotometric Detection

Abstract

An extractive flow injection analysis for rapid, sensitive and selective determination of perchlorate by spectrophotometric detection is proposed. The method is based on the extraction of perchlorate with Brilliant Cresyl Blue on methyl isobutyl ketone at pH 6.0. Perchlorate can be determined in the range of 0.008-1.00 μg/ml with a limit of detection of 0.003 μg/ml and rate of 30 ± 5 samples/h. The effects of reagent concentration, pH, manifold variables and diverse ions are completely studied. The usefulness of the method was tested for the determination of perchlorate in salt samples.

Key Words:

• Perchlorate
• Brilliant Cresyl Blue
• FIA