Determination of formaldehyde by its catalytic effect on the oxidation of pyrogallol red by bromate using flow-injection spectrophotometric detection

Authors: Ali A Ensafi, Z Nazemi

Publication date: 2007/10/1

Journal name: Journal of Analytical Chemistry

Volume: 62

Pages: 987-991

Publisher: Nauka/Interperiodica

Abstract This paper reports a simple and sensitive flow-injection method for the
spectrophotometric determination of formaldehyde based on the catalytic effect of
formaldehyde on the oxidation of pyrogallol red with bromate in acidic media. The decrease
in absorbance of the reaction mixture was measured at 470 nm. The calibration graph was
linear in the range of 0.47 to 40.0 μ/mL formaldehyde for a sample rate of 30±5 samples per
hour. The limit of detection is 0.36 μ/mL. The relative standard deviations for ten replicate ...