Abstract：In dilute sulfuric acid medium, rhodamine B could emit strong fluorescence at specific excitation wavelengths, and the fluorescence intensity was decreased after rhodamine B was oxidized by a small amount of potassium persulfate. Samarium(Ⅲ) has inhibitory effect on the oxidation reaction of potassium persulfate with rhodamine B. In the selected experimental conditions, it has a linear relationship between the inhibitory fluorescent intensity and samarium concentration, thus a fluorometry for determination of samarium was established. The influence factors were discussed, such as acidity, oxidant dosage, rhodamine B dosage, reaction time, reaction temperature and coexisting ions. The optimum reaction conditions, as well as the apparent reaction rate constant and the apparent activation energy were obtained. The linear range was 0.040-0.18 μg/mL, and the detection limit was 2.67 × 10-4 μg/mL. The method has been applied to the determination of samarium in silver alloy. The results were in accordance with those obtained by chlorophosphonazo spectrophotometry, and the relative standard deviation (n=7) was less than 2.5 %.
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