Use of porous polymers in off-line preconcentration of nitrobenzenes and their reduction products from water

Porous polymers with different functional groups were tested as sorbents for off-line preconcentration of nitrobenzenes together with their reduction products from water. In addition to 1,4-di(methacryloyloxymethyl)naphthalene-divinylbenzene porous copolymer, previously used for the solid-phase extraction of aromatic amines, three other porous polymers were used. The additional solid-phase minicolumns were packed with methacrylic ester of p,p'-dihydroxydiphenylpropane diglycidyl ether-divinylbenzene, 4,4'-bismaleimidodiphenylmethane-styrene and non-polar styrene-divinylbenzene. In order to study the sorption properties of these polymeric materials, the recoveries and breakthrough volumes of m-phenylenediamine, o-phenylenediamine, aniline, m-nitroaniline, o-nitroaniline, p-nitroaniline, nitrobenzene, m-dinitrobenzene, o-dinitrobenzene and 1,3,5-trinitrobenzene were determined.