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A first derivative spectrometric method has been developed for the determination of the para-aminobenzoic acid (PABA), a related substance and degradation product of the local anesthetic procaine hydrochloride (PH). The wavelength selected for the determination of para-aminobenzoic acid in the presence of procaine was 290 nm. At this wavelength the calibration graphs relating the amplitude of the signals to the concentration of para-aminobenzoic acid were linear up to 10 mg L(-1). The detection limit of para-aminobenzoic acid was 0.70 mg L(-1). The method is simple and rapid and does not require preliminary treatment of the sample. The method was validated.

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