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A New Chromium(III) Microelectrode Based on Self‐Assembled Diethylenetriamminepentaacetic Acid‐Poly(fuchsin basic) Modified Electrode
Author(s) -
Li Jianping,
Le Shangwang,
Li Qiuyan,
Zhang Xuehong
Publication year - 2009
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200804481
Subject(s) - electrode , chromium , chromate conversion coating , microelectrode , detection limit , quinhydrone electrode , inorganic chemistry , standard hydrogen electrode , palladium hydrogen electrode , linear range , ion , reference electrode , materials science , chemistry , analytical chemistry (journal) , electrochemistry , chromatography , metallurgy , organic chemistry
A new selective, sensitive, and rapid response microelectrode for microamount chromium(III) determination was developed. For the electrode preparation, fuchsin basic was electropolymerized onto a carbon microdisk electrode, and then diethylenetriamminepentaacetic acid (DTPA) was self‐assembled on the electrode surface by the reaction between DTPA and poly(fuchsin basic). The determination conditions were optimized. The electrode showed a linear response to Cr 3+ ions in the concentration range of 1.0×10 −6 −1.0×10 −4 M and exhibits a super‐Nernstian slope of 32.5±0.4 mV per decade. The detection limit is 3.6×10 −7 M. The response time of the electrode is less than 10 s, and it can be used for at least 2 months with limited considerable divergences in its potentials. The proposed electrode was applied for monitoring the chromium ion level in wastewater of chromate industries.