Resumen:
A novel hybrid polymer was developed and evaluated
as a sorbent for the matrix solid-phase dispersion (MSPD)
extraction of pesticides. The hybrid polymer was synthesized
by the sol–gel method and by free radical polymerization. The
chemical structure of the resulting hybrid polymer (SiO2–PVI)
was confirmed by Fourier transform infrared spectroscopy (FTIR).
Thermal analyses suggest that the polymer consists of an
organic/inorganic ratio of 28:72 wt/wt%. Scanning electron microscopy
(SEM) and elemental analysis (EDS) revealed particle
aggregates and a rough surface and suggested that the polymer
is primarily composed of SiO2. The obtained pore size was
appropriate for use in a solid-phase extraction support. X-ray
photoelectron spectroscopy (XPS) was used to assess the surface
composition of the hybrid polymer and indicated the presence
of C, N, O, and Si. The material was tested for extraction
of five selected organophosphorus pesticides (OPPs) in propolis
using gas chromatography–mass spectrometry (GC/MS). In
experiments performed in triplicate at 1.0 μg mL−1, pesticide
recovery was in the range of 81–122%. In addition, the sorbent
hybrid polymer (SiO2–PVI) demonstrated good repeatability
(RSD≤11 %), on the same order as C18 (commercial sorbent)
when tested under the same conditions. These results suggest
that SiO2–PVI hybrid polymer is a good sorptive material that
is comparable to the commercially utilized C18 and can be used
in MSPD for the extraction of organophosphorus pesticides