Huiping Bai, Chunqiong Wang, Caiyun Xiong, Miao Guo, Longchun Bian and Qiue Cao
A Novel Carbon Paste Electrode Based on Ion-Imprinted Polymer for Determination of Iridium
To develop a convenient method for sensitive and selective determination of iridium in complicated matrices, a carbon paste electrode based on iridium ion imprinted polymer (IIP) was fabricated. Iridium ion selective cavities were created in the 2-(allylthiol) nicotinic acid based cross-linked polymer. In order to fabricate the sensor, carbon particles and polymer powder were mixed with melted n-eicosane. An explicit difference in the response was observed between the electrodes modified with ion imprinted polymer (IIP) and non imprinted polymer (NIP), indicating proper performance of the recognition sites of the IIP. Various factors, known to affect the response behavior of selective electrode, were investigated and optimized. The resulting sensor named as Ir(III) ion imprinted polymer carbon paste electrode (Ir(III)-IIP/CPE) exhibits high response sensitivity to Ir(III) in acetate buffer (pH 3.6). The calibration graph is linear in the range of 2.85×10-8∼2.31×10-5 mol L-1 with the detection limit of 7.84×10-9 mol L-1(S/N). The electrode showed high selectivity for iridium in the presence of common potential interferers was found to show satisfactory results, it was successfully applied to the determination of iridium in real samples.
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