Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.22/2946
Título: Novel potentiometric sensors of molecular imprinted polymers for specific binding of chlormequat
Autor: Kamel, Ayman H.
Moreira, Felismina T. C.
Almeida, Sofia A. A.
Sales, M. Goreti F.
Palavras-chave: Chlormequat
Herbicide
Molecularly imprinted polymer
PVC membrane
Ion selective electrode
Potentiometry
Data: 2008
Editora: WILEY-VCH Verlag GmbH&Co.
Relatório da Série N.º: Electroanalysis; Vol. 20, Issue 2
Resumo: Molecularly imprinted polymers (MIP) were used as potentiometric sensors for the selective recognition and determination of chlormequat (CMQ). They were produced after radical polymerization of 4-vinyl pyridine (4-VP) or methacrylic acid (MAA) monomers in the presence of a cross-linker. CMQwas used as template. Similar nonimprinted (NI) polymers (NIP) were produced by removing the template from reaction media. The effect of kind and amount of MIP or NIP sensors on the potentiometric behavior was investigated. Main analytical features were evaluated in steady and flow modes of operation. The sensor MIP/4-VP exhibited the best performance, presenting fast near-Nernstian response for CMQover the concentration range 6.2×10-6 – 1.0×10-2 mol L-1 with detection limits of 4.1×10-6 mol L-1. The sensor was independent from the pH of test solutions in the range 5 – 10. Potentiometric selectivity coefficients of the proposed sensors were evaluated over several inorganic and organic cations. Results pointed out a good selectivity to CMQ. The sensor was applied to the potentiometric determination of CMQin commercial phytopharmaceuticals and spiked water samples. Recoveries ranged 96 to 108.5%.
Peer review: yes
URI: http://hdl.handle.net/10400.22/2946
Versão do Editor: http://onlinelibrary.wiley.com/doi/10.1002/elan.200704039/abstract
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