The determination of the herbicide terbacil in asparagus spears by gas chromatography

Abstract

Cessna, A. J. 1991. The determination of the herbicide terbacil in asparagus spears by gas chromatography. Can. J. Plant Sci. 71: 915 921. In aT-yr study, asparagus spears from established plantings at two sites in British Columbia and one site in Ontario were analyzed for terbacil residues following preemergence and early postemergence applications of terbacil at 0.6, 1.1 and2.2 kg ha-'. Gas chromatographic determination of terbacil residues using N-specific alkali flame ionization detection indicatedlh;t at one site, maximum terbacil residues in the preemergence samples were 14 + 3 pg kg ' for the 2.2 kg ha I application rate, whereas maximum residues in the early postemergence samples for the 2.2 kE ha-r apptication rate were 493 + 250 pg kg-l at a second site. Recoveries For personal use only.

A gradual advancement of the extraction and cleanup techniques for residue analysis of pesticides in food matrices and liquid products: a review

“…Its importance in the analysis of plant material resides in the fractionation of certain residues according to their polarity without appreciable losses. Many authors 32,[22][23][24][25][26][27]33 have used silica gel columns or mini-columns for the clean-up of sample extract. Lores et al, 34 used an improved silica gel clean-up method for organophosphorus pesticides.…”

“…For the analysis plant material, Florisil has been recommended often in the framework of multi-residue procedures for fruits and vegetables. Florisil columns have been used for the clean-up of plant extracts by many authors [19][20][21][22][23][24][25][26][27][28] . In many cases, Florisil can be replaced by alumina, particularly for the analysis of fatty foods.…”