亚硫酸根离子荧光化学传感器的研制

A Sulfite Optical Chemical Sensor

亚硫酸根离子对固定于聚氯乙烯(PVC)膜中的5,10,15,20四苯基卟啉(TPP)/t(2,6二氧异丁基)β环糊精(DOBβCD)有可逆荧光熄灭作用。据此研制成测定亚硫酸根离子浓度的荧光化学传感器,该传感器敏感膜最佳组成质量分数为PVC308%,BOS615%,TPP150%,DOBβCD620%。在pH=65的KOHKH2PO4缓冲溶液底液中测定亚硫酸根离子,其线性响应范围为622×10-6～311×10-4mol/L,检测限为780×10-7mol/L,其响应时间小于40s。其它常见阴离子和阳离子不干扰测定。可用于实际样品中亚硫酸根离子含量的测定。

An optical chemical sensor has been developed to detect sulfite based on reversible fluorescence quenching of tetraphenylporphyrin(TPP)/2,6 di o isobutyl β cyclodextrin(DOB β CD) immobilized in a plasticized poly(vinyl chloride)(PVC) membrane. The optimum sensor membrane consists of 50 mg of PVC, 100 mg of bis(2 ethytbexyl) sebacate(BOS), 2 5 mg of TPP and 10 mg of DOB β CD. The maximum response of the optode memberane for sulfite was obtained in a KOH KH 2 PO 4 buffer solution of pH=6 5. The sensor respond...