A new fluorimetry system for the determination of trace of benzoic acid in sauce samples

At the present of Co2+,benzoic acid with weak fluore may react on OH,and then products with intense fluoressence were made.Base on the linear response of the relative fluorescence intensity to the benzoic acid concentration,a novel catalysis kinetics fluorimetry system for the determination of trace of benzoic acid was established with the determination limit of 8.0×10-8 g·mL-1.The linear range was 2.0×10-7-8.0×10-6 g·mL-1.The relative standard deviation(n=9) is 2.4% for 8.0×10-7 g·mL-1 benzoic acid and the system has been applied to the determination of benzoic acid in sauce samples with satisfactory results.