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

Hua Lei Cui, Huijing Jiang, R Meng, Chun He, Huimin Zhao

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%.

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Key concepts: Chemiluminescence, Luminol, Detection limit, Chemistry, Flow injection analysis, Coefficient of variation, Chromatography, Analytical Chemistry (journal)