| Abstract
| - A series of novel anion-selective electrodes were developed by incorporating lipophilic lanthanide tris(β-diketonates) into plasticized poly(vinyl chloride) membranes.The new electrodes exhibited high selectivity toward Cl-anion in the concentration range of Cl- anion between 1.0× 10-5 and 1.0 × 10-1 mol/L with near-Nernstian slopesand practically low detection limits. They offered non-Hofmeister anion selectivity, and interestingly discriminated Cl- anion from NO3-, ClO4-, and other anions.Since the employed lanthanide tris(β-diketonates) wereconfirmed to form 1:1 highly coordinated complexes withCl- anion, the observed high selectivity for Cl- anion wasattributed to the characteristics of lanthanide coordinationchemistry. All the prepared sensors worked well at neutralpH with quite short response time, <30 s, and could beused for longer than four months without any significantdivergence in performance.
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