Institute of Materials Chemistry, Key Laboratory of Advanced Civil Engineering Materials, College of Materials Science and Engineering, Tongji University, 1239 Si-Ping Road, Shanghai 200092, China.
Anal Chem. 2012 Jan 3;84(1):134-40. doi: 10.1021/ac2028886. Epub 2011 Dec 7.
A newly designed Pb(II) potentiometric sensor based on intrinsically conducting nanoparticles of solid poly(aniline-co-2-hydroxy-5-sulfonic aniline) possessing many ligating functional groups like -NH-, -N=, -OH, -SO(3)H, -NH(2) as ionophores in plasticizer-free vinyl resin solid membranes has been fabricated. A linear Nernstian response is obtained within a wide Pb(II) activity range from 1.0 × 10(-3) to 1.0 × 10(-10) M with a detection limit as low as 2.2 × 10(-11) M. The pH independent plateau ranges between 3.5 and 7.0. After 15 months' usage, the sensor maintains 95% performance parameters. Its anti-interference ability to Cu(II), Cd(II), Ag(I), and Hg(II) is much stronger than other sensors with a detection limit at (sub)nanomolar level. Electrochemical impedance spectroscopy reveals that the solid sensing membrane has a diffusion coefficient of around 5 × 10(-14) to 1 × 10(-13) cm(2) s(-1). The much lower diffusion coefficient for Pb(II) is highly beneficial for the elimination of Pb(II) flux across the membrane. The wide detection concentration range, low detection limit, high selectivity, extensive pH window, and long lifetime make for a robust sensor giving reliable measurement of Pb(II) content with potential application in real-world samples at trace levels.
一种新设计的基于固相聚苯胺-共-2-羟基-5-磺酸苯胺的本征导电纳米粒子的 Pb(II) 电位传感器，具有许多配位官能团，如 -NH-、-N=、-OH、-SO(3)H、-NH(2) 作为离子载体在无增塑剂的乙烯基树脂固体膜中。在宽 Pb(II) 活度范围内（从 1.0×10(-3) 到 1.0×10(-10) M）获得线性 Nernst 响应，检测限低至 2.2×10(-11) M。pH 独立平台范围在 3.5 到 7.0 之间。使用 15 个月后，传感器保持 95%的性能参数。与其他检测限在亚纳摩尔级别的传感器相比，它对 Cu(II)、Cd(II)、Ag(I)和 Hg(II) 的抗干扰能力要强得多。电化学阻抗谱表明，固体传感膜的扩散系数约为 5×10(-14) 到 1×10(-13) cm(2) s(-1)。Pb(II) 的低扩散系数有利于消除 Pb(II) 通量穿过膜。宽的检测浓度范围、低的检测限、高的选择性、广泛的 pH 窗口和长的寿命使得传感器具有稳健性，能够可靠地测量 Pb(II) 含量，具有在实际样品中痕量水平下应用的潜力。
