Abstract:
A Spectrophotometric method for the trace determination of p-amino benzoic acid (PABA) has been proposed .The method is based on the coupling diazotized (PABA) with p-2-naphthol in basic medium to from a yellow ,stable and water soluble .azo-dye which shows and a maximum absorption at 299 nm and obeys Beer Lambert low in consent ration range (0.5-4)ml .cm-3 of PABA in final volume of 50 ml. The present method has been Applied successfully to determination of PABA which result from hydrolysis of procaine drug. The accuracy which was obtained equal to 97%.