Sequential stir bar extraction, thermal desorption and retention time locked GC–MS for determination of pesticides in water

Abstract

A method based on sequential stir bar sorptive extraction followed by automated thermal desorption-GC-MS for the determination of pesticides in underground and superficial water samples has been developed. Retention time locked GC-MS and deconvolution Automated Mass Spectral Deconvolution and Identification System software allows the use of pesticide databases for identification and quantification in routine applications. Quantitation limits and repetitivity using full scan mass spectrometric determination guarantee the applicability of the method, which enables considerable savings to be made in total analysis time, with data processing times of around 2 min/sample.

Stir-bar sorptive extraction: 15 years making sample preparation more environment-friendly

“…Even so, these analytical limitations can be overcome by using SBSE(PDMS) in dual or sequential modes [10,17,47,48], adopting a compromise with the purpose of increasing the efficiency yields and the overall sensitivity.…”

Food-Packaging Contaminants

“…65 However, the SBSE technique has difficulty in extracting efficiently both hydrophobic and hydrophilic compounds. 67,68 Both SPME and SBSE provide enhanced sensibility compared to traditional extraction procedures because the devices are introduced directly into the thermal desorption port without any losses. 68 The application to a variety of water samples makes this technique very useful.…”

“…67,68 Both SPME and SBSE provide enhanced sensibility compared to traditional extraction procedures because the devices are introduced directly into the thermal desorption port without any losses. 68 The application to a variety of water samples makes this technique very useful. 69 Recently Guart et al 70 used SBSE to determine a large number of contaminants in bottled water from around the world, and plasticisers and additives were among the most detected compounds.…”

A retention time locked gas chromatography–mass spectrometry method based on stir-bar sorptive extraction and thermal desorption for automated determination of synthetic musk fragrances in natural and wastewaters

“…Therefore, carrier and split flow stability and retention time reproducibility are superior to systems using the electronic control modules or the manual pressure control systems of the GC. This has enabled the use, with complete guarantee, of the retention time locked systems (RTL) [27], designed to reproduce retention times in long-term despite system maintenance or other perturbations by adjusting the carrier gas flow. Retention time is a critical component of sample identification, and the mass spectra of the compounds in the database libraries may be acquired using retention time locking (RTL) [28].…”