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Multiwalled carbon nanotubes have been used for the first time as solid-phase extraction sorbents for the extraction of five N-methylcarbamate insecticides (i.e., carbaryl, carbofuran, aminocarb, methiocarb, and zectran) from different surface water samples. An effective and sensitive method was developed by combining solid-phase extraction and liquid chromatography–electrospray ionization–mass spectrometry...