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Sol‐Gel Derived Carbon Ceramic Electrode Bulk‐Modified with Tris (1, 10‐phenanthroline‐5, 6‐dione) iron (II) Hexafluorophosphate and Its Use as an Amperometric Iodate Sensor
Author(s) -
Wang Peng,
Zhu GuoYi
Publication year - 2002
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20020200208
Subject(s) - chemistry , iodate , amperometry , hexafluorophosphate , detection limit , electrode , inorganic chemistry , carbon paste electrode , analytical chemistry (journal) , electrochemistry , cyclic voltammetry , chromatography , catalysis , iodide , organic chemistry , ionic liquid
A surface‐renewable tris(1, 10‐phenanthroline‐5, 6‐dione) iron (D) hexafluorophosphate (FePD) modified carbon ceramic electrode was constructed by dispersing FePD and graphite powder in methyltrimethoxysilane (MTMOS) based gels. The FePD‐modified electrode presented pH‐dependent voltammetric behavior, and its peak currents were diffusion‐controlled in 0.1 mol/L Na 2 SO 4 + H 2 SO 4 solution (pH = 0.4). In the presence of iodate, dear electrocatalytic reduction waves were observed and thus the chemically modified electrode was used as an amperometric sensor for iodate in common salt. The linear range, sensitivity, detection limit and response time of the iodate sensor were 5 × 10 −6 –1 × 10 −2 mol/L, 7.448 μA·L/ mmol, 1.2 × 10 −6 mol/L and 5 s, respectively. A distinct advantage of this sensor is its good reproducibility of surface‐renewal by simple mechanical polishing.