Application of the precolumn back-flush technology in pesticide residue analysis: a practical view.

摘要: Precolumn back-flushing is a matrix minimization technique in GC which the carrier gas flow of precolumn reversed after transfer highest boiling analyte to analytical column. Practical details concerning this technology have rarely been published although it widely used. This paper now focuses on practical implementation for pesticide residue analysis complex food matrices. Fitting column into was found be essential comparable responses with and without back-flushing. The effectiveness reverse mainly affected by time starts. depend kind injected used state precolumn. For regular adaptation routine analysis, simple test introduced 13-C-labeled deltamethrin indeno[1,2,3-c,d]pyrene were added prepared extract. Chromatograms, LOQ RSD up 99 pesticides citrus oil liver extracts proved clearer identification enhanced quantification using compared measurements technology. Furthermore, reduced system maintenance could achieved through