Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 141, Issue 2, Pages 544-550Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2009.05.024
Keywords
Molecularly imprinted polymer; Potentiometric sensor; Melamine; Ion-selective electrode; Flow analysis
Funding
- Chinese Academy of Sciences [KZCX2-YW-410]
- National Natural Science Foundation of China [40776058]
- Ministry of Science and Technology of China [2007AA09Z103]
- Department of Science and Technology of Shandong Province [2006GG2205033]
- Outstanding Youth Natural Science Foundation of Shandong Province [JQ200814]
- Taishan Scholar Program of Shandong Province
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A polymeric membrane ion-selective electrode for determination of melamine is described in this paper. it is based on a molecularly imprinted polymer (MIP) for selective recognition, which can be synthesized by using melamine as a template molecule, methacrylic acid as a functional monomer and ethylene glycol dimethacrylate as a cross-linking agent. The membrane electrode shows near-Nernstian response (54 mV/decade) to the protonated melamine over the concentration range of 5.0 x 10(-6) to 1.0 x 10(-2) mol L-1. The electrode exhibits a short response time of similar to 16 s and can be stable for more than 2 months. Combined with flow analysis system, the potentiometric sensor has been successfully applied to the determination of melamine in milk samples. Interference from high concentrations of ions co-existing in milk samples such as K+ and Na+ can be effectively eliminated by on-line introduction of anion- and cation-exchanger tandem columns placed upstream, while melamine existing as neutral molecules in milk of pH 6.7 can flow through the ion-exchanger columns and be measured downstream by the proposed electrode in an acetate buffer solution of pH 3.7. (C) 2009 Elsevier BY. All rights reserved.
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