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目的:为研究测定石油制品中硫化物的光纤化学传感器提供实验基础。方法:采用溶胶-凝胶法制备芘丁酸-二氧化硅敏感膜(试剂项),根据荧光多元猝灭响应原理测定正己烷中单质硫的含量。结果:单质硫在0.75～15.00μg/ml浓度范围内与lg(F0/F)成线性关系,r=0.999 3。检出限为0.75μg/ml,平均回收率为(103.2±7.5)％。结论:用芘丁酸-二氧化硅试剂相测定正己烷溶液中的单质硫含量可取得较好的精密度、回收率和可逆度。
Objective: To provide an experimental basis for the research of optical fiber chemical sensors for the determination of sulfide in petroleum products. Methods: The pyrene butyric acid - silica sensitive membrane (reagent item) was prepared by sol - gel method. The content of elemental sulfur in n - hexane was determined according to the principle of fluorescence multiple quenching reaction. Results: Elemental sulfur had a linear relationship with lg (F0 / F) in the range of 0.75 ~ 15.00μg / ml, r = 0.999 3. The detection limit was 0.75μg / ml, the average recovery was (103.2 ± 7.5)%. Conclusion: The pyrene butyric acid - silica reagent phase can be used to determine the content of elemental sulfur in n-hexane solution to obtain better precision, recovery and reversibility.