介绍了一种基于螯合剂功能化的拉锥光纤传感器，用于定量检测低浓度重金属铅离子Pb²⁺。该传感器由单模和四芯光纤制成，并对中间四芯光纤进行拉锥到直径15 μm。在此基础上，使用乙二胺四乙酸（EDTA）作为金属螯合剂固定在拉锥四芯光纤传感器表面，从而实现对铅离子Pb²⁺的高灵敏度检测。实验结果表明，该传感器对重金属铅离子Pb²⁺检测限为1 ng/mL。此外，该传感器具有良好的稳定性，以及制备工艺简单和响应速度快等优点。

In this paper, a tapered optical fiber sensor based on chelating agent functionalization is presented for the quantitative detection of low concentration heavy metal Pb²⁺. The sensor is made of single mode and four core fiber, and the middle four core fiber is tapered to a diameter of 15 microns. On this basis, ethylenediamine tetraacetic acid was used as a metal chelating agent to coat on the surface of a tapered four-core optical fiber sensor, so as to achieve high sensitivity detection of lead ions Pb²⁺. Experimental results show that the detection limit of Pb²⁺ is 1 ng/mL. In addition, the sensor has the advantages of good stability, simple preparation process and fast response speed.