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Novel potentiometric sensors of molecular imprinted polymers for specific binding of chlormequat
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Orientador(es)
Resumo(s)
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%.
Descrição
Palavras-chave
Chlormequat Herbicide Molecularly imprinted polymer PVC membrane Ion selective electrode Potentiometry
Contexto Educativo
Citação
Editora
WILEY-VCH Verlag GmbH&Co.