On-line determination of organophosphorus pesticides in water by solid-phase microextraction and gas chromatography with thermionic-selective detection

✍ Scribed by Lopez-Avila, Viorica ;Young, Richard ;Beckert, Werner F.

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 482 KB
• Volume: 20
• Category: Article
• ISSN: 0935-6304
• DOI: 10.1002/jhrc.1240200905

✦ Synopsis

Abstract

This paper describes the extraction of 49 organophosphorus pesti‐cides (OPPs) from water samples using solid‐phase microextraction (SPME). Three fibers, including a 15‐μm XAD‐coated fiber, a 85‐μm polyacrylate‐coated fiber, and a 30‐μm polydimethylsilox‐ane‐coated fiber (PDMS), were evaluated here. The effects of stirring and the addition of NaCl to the sample were examined for the polyacrylate‐coated fiber. The precision of the technique was examined for all three fibers and the extraction kinetics were investigated using the XAD‐ and polyacrylate‐coated fibers. With some exceptions, the XAD‐ and polyacrylate‐coated fibers performed better than the PDMS‐coated fiber. The superiority of the XAD‐nd polyacrylate‐coated fiber. The superiority of the XAD‐ and polyacrylate‐coated fibers over the PDMS‐coated fibers can be attribuibuted to the aromatic functionalities of the XAD and the polar functionalities in the polyacrylate. The relatively high percent RSDs indicate that the SPME technique needs to be further refined before it can be used for anything other than screening. A more effective form of agitation than mechanical stirring may be neccessary to reduce variability and achieve a faster equilibrium between the sample and the SPME fiber.