Poly(methyloctylsiloxane) immobilized on silica as a sorbent for solid-phase extraction of some pesticides.
J Chromatogr A
; 1114(2): 211-5, 2006 May 12.
Article
en En
| MEDLINE
| ID: mdl-16600261
ABSTRACT
A laboratory-made sorbent for solid-phase extraction (SPE) was obtained by thermal immobilization of poly(methyloctylsiloxane) (PMOS) onto silica. Cartridges packed with the new sorbent were used for the simultaneous determination of imazethapyr, nicosulfuron, diuron, linuron and chlorimuron-ethyl in water. These pesticides were separated and quantified using high-performance liquid chromatography with diode array detection (HPLC-DAD). The recoveries achieved with the laboratory-made PMOS cartridges were compared with those of some commercially available silica-based and polymer-based cartridges having C18, C8 and NH(2) pendant groups. Method validation using the laboratory-made sorbent was performed for the five pesticides at three fortifications levels (1x, 2x and 10x the limit of quantification of each pesticide). The laboratory-made PMOS cartridge has low cost preparation and showed good recoveries (72-111%) for all pesticides. Repeatability and intermediate precision were lower than 15%. Its performance was similar or even better, in some cases, than those of the commercial cartridges.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Plaguicidas
/
Polímeros
/
Siloxanos
/
Dióxido de Silicio
Tipo de estudio:
Diagnostic_studies
/
Evaluation_studies
Idioma:
En
Revista:
J Chromatogr A
Año:
2006
Tipo del documento:
Article
País de afiliación:
Brasil