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:50.0βmg PVC、100.0βmg邻苯二甲酸二异辛酯和2.94βmg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4.00~6.00βmmol·L-1,检出限为0.10βμmol·L-1,响应时间小于50βs。该传感器具有良好的重现性、可逆性和选择性,除Cr2O72-和MnO4-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。
Abstract
An optical chemical sensing membrane based on reversible fluorescence enhancement of Erythromycin A immobilized in a plasticized poly (vinyl chloride) (PVC) membrane for Lead (Ⅱ) detection was developed. The membrane of the sensor consists of 50 mg of PVC, 100 mg of Di (2-ethylhexyl) phthalate and 2.94 mg of Erythromycin A. The maximum response of the sensing membrane to Lead (Ⅱ) was obtained in Tris/HCl buffer solution ( pH 8.0). Under optimal conditions, the proposed sensor responded linearly to Lead (Ⅱ) in the range of 4.00-6.00 mmol/L and had a detection limit of 0.10 μmol·L-1. The response time of the sensor was less than 50 s. In addition to the high reproducibility and reversibility of the fluorescence signal, the sensor also exhibited good selectivity. Except for Cr2O72- and MnO4-, it was not interfered by other common metal ions and anions. It was applied 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 /
红霉素A /
铅(Ⅱ); /
荧光增强
Key words
erythromycin A /
fluorescence enhancement /
lead(Ⅱ) /
optical chemical sensor
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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)