用于测定黑茶中铅的荧光增强化学传感器  

A Sensing PVC Membrane Based on Fluorescence Enhancement of Erythromycin A for Lead(Ⅱ) Detection in FU Tea

作　　者：龙立平[1] 孟维[1] 王姣亮[1] 谢丹[1] 贺国文[1] 肖谷清[1] LONG Liping;MENG Wei;WANG Jiaoliang;XIE Dan;HE Guowen;XIAO Guqing(College of Chemistry & Environmental Engineering, Hunan City University, Yiyang 413049, China)

机构地区：[1]湖南城市学院化学与环境工程学院,湖南益阳413049

出　　处：《茶叶科学》2017年第3期273-279,共7页Journal of Tea Science

基　　金：国家自然科学基金资助项目(21545003;21502048);湖南省自然科学基金资助项目(2015JJ2023;13JJ3117);湖南省高校科技创新团队支持计划资助项目(湘教通[2014]207号);湖南省黑茶金花重点实验室资助项目(湘科规财[2016]8号)

摘　　要：铅(Ⅱ)对固定在增塑的聚氯乙烯(PVC)敏感膜中的红霉素A有可逆荧光增强作用,据此研制了测定铅(Ⅱ)的荧光化学传感器。该传感膜的组成为:50.0 mg PVC、100.0 mg邻苯二甲酸二异辛酯和2.94 mg红霉素A。该传感器在pH 8.0的Tris-HCl缓冲溶液中,测定铅(Ⅱ)的动力学范围为4.00~6.00 mmol·L^(-1),检出限为0.10μmol·L^(-1),响应时间小于50 s。该传感器具有良好的重现性、可逆性和选择性,除Cr_2O_7^(2-)和MnO_4^-外,常见阴离子和阳离子不干扰测定。该传感器应用于黑茶水样中铅(Ⅱ)含量的测定,结果与GB 5009.12—2010法一致。An optical chemical sensing membrane based on reversible fluorescence enhancement of Erythromycin Aimmobilized in a plasticized poly(vinyl chloride)(PVC)membrane for Lead(Ⅱ)detection was developed.Themembrane of the sensor consists of50mg of PVC,100mg of Di(2-ethylhexyl)phthalate and2.94mg ofErythromycin A.The maximum response of the sensing membrane to Lead(Ⅱ)was obtained in Tris/HCl buffersolution(pH8.0).Under optimal conditions,the proposed sensor responded linearly to Lead(Ⅱ)in the range of4.00-6.00mmol/L and had a detection limit of0.10μmol·L-1.The response time of the sensor was less than50s.Inaddition to the high reproducibility and reversibility of the fluorescence signal,the sensor also exhibit ed goodselectivity.Except for Cr2O72-and MnO4-,it was not interfered by other common metal ions and anions.It wasapplied for the determination of Lead(Ⅱ)in a sample of FU Tea,which offered a satisfactory result.

关 键 词：光化学传感器 荧光增强 铅(Ⅱ) 红霉素A 

分 类 号：O657.3[理学—分析化学] TS272.7[理学—化学]