Flow injection determination of formaldehyde by its catalytic effect on the oxidation of sulfonazo III by bromate with spectrophotometric detection

Authors: Ali Asghar ENSAFI, Ebrahim HONARMAND

Publication date: 2005

Journal name: Analytical sciences

Volume: 21

Pages: 545-548

Publisher: 社団法人日本分析化学会

A simple and sensitive flow injection method with spectrophotometric detection was
developed for the determination of formaldehyde. The method is based on the catalytic effect
of formaldehyde on the oxidation of sulfonazo III with bromate in acidic media. The decrease
in absorbance of the reaction mixture was measured at 566 nm. The calibration graph was
linear in the range of 0.005 to 2.80 µg ml-1 formaldehyde at a rate of 38±4 samples h-1. The
limit of detection was 4 ng ml-1. The relative standard deviations for ten replicate ...