Poly(methyloctadecylsiloxane) immobilized on silica by γ radiation for use in solid-phase extraction

This work presents a fast, easy and effective procedure to obtain silica-based C-18 type sorbents for use in solid-phase extraction (SPE), The solid-phase was made by depositing a polymer, poly(methyloctadecylsiloxane) (PMODS), on the silica support followed by immobilization using gamma irradiation. The method presents an application of green chemistry in the analytical laboratory, since there are no toxic residues after the synthesis. Water samples spiked with a mixture of pesticides (benomyl, tebuthiuron, diuron, simazine, atrazine and ametryn) were extracted in the off-line mode in order to evaluate the performance of this sorbent. (C) 2002 Elsevier Science B.V. All rights reserved.