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Voltammetric Ion‐Selective Nanocomposite Carbon Paste Electrode for Determination of Erbium at the Interface Between two Immiscible Electrolyte Solutions
Author(s) -
Mirshafian R.,
Norouzi P.,
Ganjali M. R.
Publication year - 2012
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.201100580
Subject(s) - detection limit , electrolyte , carbon paste electrode , ionophore , redox , electrode , aqueous solution , analytical chemistry (journal) , electrochemistry , inorganic chemistry , nanocomposite , chemistry , carbon fibers , supporting electrolyte , materials science , cyclic voltammetry , membrane , chromatography , nanotechnology , composite number , biochemistry , composite material
In this study for the first time a novel erbium(III) voltammetric ion‐selective nanocomposite carbon‐paste electrode was introduced based on the concept of ion transfer at the interface between two immiscible electrolyte solutions. N ′‐(2‐hydroxy‐1,2‐diphenylethylidene) benzohydrazide (HDB) was used as a selective ionophore in the composition of the carbon paste. The ionophore facilitates transfer of Er(III) from the aqueous solution to the room temperature ionic liquid (RTIL) phase after reduction of the redox probe to maintain charge neutrality. The plot of the peak potential versus the logarithm of the concentration exhibits a Nernstian response (19.9±0.2 mV decade −1 ) toward Er(III) in the range of 7.5×10 −7 –1.0×10 −1 mol L −1 with detection limit of 5.0×10 −7 mol L −1 . The proposed sensor shows a fast response time of about 5 s.