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A combination of magnetic solid phase extraction (MSPE) and dispersive liquid phase microextraction (DLPME) was applied in a new method for preconcentration and extremely sensitive determination of thallium in aqueous samples. The first step of extraction uses a Fe3O4-graphene oxide conjugate whose surface was covalently linked to the chelator 4-methyl-2(2-pyrazinyl)-1,3-thiazole-5-carboxy acid. After...