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- Title
Stable Pb(II) ion-selective electrodes with a low detection limit using silver nanoparticles/polyaniline as the solid contact.
- Authors
Zeng, Xianghua; Jiang, Wenwen; Waterhouse, Geoffrey I. N.; Jiang, Xiaohui; Zhang, Zhiming; Yu, Liangmin
- Abstract
Solid contact-based ion-selective electrodes (SC-ISEs) based on silver nanoparticles/polyaniline (Ag@PANI) as the solid contact (SC) were successfully prepared. The Ag@PANI SC showed high capacitance and excellent electron transport performance. Owing to the synergetic effects of the Ag nanoparticles and PANI, a GC/Ag@PANI-II/Pb2+-ISE (where II refers to a Ag content of 0.01 wt% in the SC layer) showed a low Pb2+ detection limit (6.31 × 10−10 M) with a slope of 29.1 ± 0.3 mV/dec, a fast response (< 5 s), and high stability. GC/Ag@PANI-II/Pb2+-ISE exhibited a Nernstian response for Pb2+ ions over a wide concentration range (10−3 to 10−9 M). After a 3-week operation, GC/Ag@PANI-II/Pb2+-ISE responded linearly to Pb2+ over the range of 10−7–10−3 M, demonstrating good long-term potential stability. Furthermore, the electrode showed excellent reproducibility and repeatability of the potential values and was successfully applied to detect the Pb2+ concentration in real samples with a recovery of 97 − 109%. Results suggest that Ag@PANI composites offer good transducer performance in trace ion detection sensors.
- Subjects
POLYANILINES; SILVER nanoparticles; DETECTION limit; ELECTRODES; ELECTRON transport; SOLIDS
- Publication
Microchimica Acta, 2021, Vol 188, Issue 11, p1
- ISSN
0026-3672
- Publication type
Article
- DOI
10.1007/s00604-021-05046-y