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A new fluorescence quenching method has been developed for the determination of platinum in nonionic mieroemulsion medium.This method is based on the fact that platinum can form a stable chelate with dibromohydroxyphenyl-fluorine (DBHPF) when they are in the molar ratio of 1:2 in the nonionic microemulsion medium.Under optimum conditions,the system,having the maximum excitation and emission wavelengths at 468 nm and 532 nm,respectively,shows constant fluorescence intensity in the pH range of 3.5-4.0 and high selectivity and sensitivity as well as low interference from foreign ions.Furthermore,this fluorescence intensity is a linear function of Pt(Ⅳ) concentration in the range of 0.002-1.00 μg·mL-1 and the limit of detection is 2.90 ng·mL-1.