用于测定黑茶中铅的荧光增强化学传感器

Abstract

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 Cr₂O₇^2-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.

Key words: optical chemical sensor, fluorescence enhancement, lead(Ⅱ), erythromycin A

CLC Number:

LONG Liping, MENG Wei, WANG Jiaoliang, XIE Dan, HE Guowen, XIAO Guqing. A Sensing PVC Membrane Based on Fluorescence Enhancement of Erythromycin A for Lead (Ⅱ) Detection in FU Tea[J]. Journal of Tea Science, 2017, 37(3): 273-279.

References 12

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

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