Capillary gas chromatography of pesticide residues in foods: Application of a split/splitless inlet system

✍ Scribed by Daft, J. L.

• Publisher: John Wiley and Sons
• Year: 1983
• Tongue: English
• Weight: 557 KB
• Volume: 6
• Category: Article
• ISSN: 0935-6304
• DOI: 10.1002/jhrc.1240060904

✦ Synopsis

Residue mixtures of pesticides in foods which were difficult to separate by packed-column gas chromatography were determined by capillary gas chromatography and electron capture detection. Manual injections of sample and reference standard were made with a 10 pL syringe on a septum-enclosed, split/ splitless inlet system. Optimal peak height repeatability (+ 3%) was achieved with three-pL injections which were made within time periods of four hours or less. The average linearity coefficient (slope) obtained for detector response as a function of solution concentration was 1 .l. Operating temperatures were, injector port, 225OC [ l 11; column, 1 5OoC or 2OOOC isothermal; and detector, 35OOC. 480 Journal of High Resolution Chromatography & Chromatography Communications 0 1983 Dr. Alfred Huethig Publishers

2.4 Sample Preparation and Cleanup

Fresh or frozen fruits, vegetables, and fish, and processed foods were made into individual composites with grinding or blending. Samples from FDA's Total Diet Study [I 2,131,