Poly(methyltetradecylsiloxane) immobilized onto silica for extraction of multiclass pesticides from surface waters

A new material based on poly(methyltetradecylsiloxane) (PMTDS) thermally immobilized onto a silica support has been tested as a sorbent for the solid-phase extraction (SPE) from water of several pesticides used in soybean cultivation. The SPE methodology was developed and validated for six of these...

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Bibliographic Details
Published in:Analytica chimica acta 2007-01, Vol.582 (1), p.34-40
Main Authors: Faria, Anizio M., Maldaner, Liane, Santana, César C., Jardim, Isabel C.S.F., Collins, Carol H.
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Chromatographic methods and physical methods associated with chromatography
Chromatography, High Pressure Liquid - methods
Exact sciences and technology
Herbicides
High-performance liquid chromatography-diode array detection
Laboratory-made solid-phase extraction cartridges
Other chromatographic methods
Pesticide Residues - classification
Pesticide Residues - isolation & purification
Poly(methyltetradecylsiloxane)
Reproducibility of Results
Sensitivity and Specificity
Silicon Dioxide - chemistry
Siloxanes - chemistry
Soybeans
Spectrum Analysis
Water Pollutants, Chemical - classification
Water Pollutants, Chemical - isolation & purification
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Summary:A new material based on poly(methyltetradecylsiloxane) (PMTDS) thermally immobilized onto a silica support has been tested as a sorbent for the solid-phase extraction (SPE) from water of several pesticides used in soybean cultivation. The SPE methodology was developed and validated for six of these pesticides (imazethapyr, imazaquin, metsulfuron-methyl, bentazone, chlorimuron-ethyl and tebuconazole) according to the International Conference on Harmonization directives and the results were compared with those obtained with a commercial C18 SPE cartridge. The PMTDS-based sorbent gives results similar to the commercial sorbent with recoveries and precisions in agreement with directives for residue analysis. The quantification limits, after concentration, of all the pesticides evaluated were 1.0 μg L −1, below the levels imposed by the principal regulatory agencies. The PMTDS-based sorbent preparation is fast, easy and reproducible and the cartridges are less expensive than similar commercial SPE materials.
ISSN:0003-2670
1873-4324
DOI:10.1016/j.aca.2006.08.046