[Flow injection analysis of 3,4-dihydroxybenzoic acid with inhibited chemiluminescent detection].

Abstract

It was found that 3,4-dihydroxybenzoic acid (protocatechuric acid) inhibited chemiluminescence of luminol-H2O2 reaction catalyzed by Co2+. On this basis, a flow injection method has been developed for the determination of protocatechuric acid. The method is simple, convenient and sensitive with detection limit of 2.7 x 10(-7) mol/L and is effective to determine protocatechuric acid in the range of 1 x 10(-6)-1 x 10(-5) mol/L. The variation coefficient of eleven determinations for 8 x 10(-6) mol/L protocatechuric acid is 2.3%.