Abstract
p-Aminobenzoic acid and several other molecules were found to phosphoresce at room temperature when adsorbed on sodium acetate. A unique phosphorimetric method is described for determining p-aminobenzoic acid without separation in multicomponent vitamin tablets. The reflected phosphorescence of p-aminobenzoic acid adsorbed on sodium acetate was measured in the quantitation step. The method is rapid, very selective, and sensitive for p-aminobenzoic acid. The limit of detection is about 0.5 ng per sample spot and the relative standard deviation is 2.4% at 5 mg per tablet. p-Hydroxy-benzoic acid, folic acid, and the benzamide of p-aminobenzoic acid also exhibited room temperature phosphorescence when adsorbed on sodium acetate. Phosphorescence data on these molecules are reported.
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