A rapid and sensitive method is described for the determination of phenolic acid concentrations in soil. The method consists of extraction with 0.1 M NaOH for 16 h, centrifugation, filtration, pH adjustment to reduce detector interference, and liquid chromatographic separation on a C18 column and UV detection at 280 nm. Recoveries of 6 phenolic acids (ferulic, p-coumaric, caffeic, syringic, vanillic, and p-hydroxybenzoic) were 58,100,0,66,83, and 123%, respectively. The limits of detection were 0.5 μg/g for p-hydroxybenzoic, vanillic, and syringic acids and 1.0 μg/g for ferulic and p-coumaric acids. Caffeic acid was not detectable with this method.
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