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CORESTA Congress, New Orleans, 2002, STPOST 06

Determination of pyrethroid residues in cigar tobacco

MOLA M.; LIONETTI G.; NUNZIATA A.
ETI S.p.A., Research, Chemistry Dept., Rome, Italy.

Currently, a method for the analysis of pyrethroid residues is being tested by the CORESTA Sub-group Pesticides. It was selected among methods used in different Sub-group members' laboratories and is being tested on Burley tobacco. The purpose of our work is to see if this method is applicable to other varieties of tobacco, such as Kentucky or other dark tobaccos used for cigar manufacturing. The first step of the method consists of an extraction using hexane. The tobacco sample is successively macerated and then centrifuged for five minutes. The second step is a cleanup with SPE cartridges. In our case a 5 ml aliquot of the sample extract was passed through a Florisil cartridge and collected into a 20 ml tube. The cartridge was then eluted with 5 ml toluene and collected in the same tube. Finally, after transferring to GC vials, the samples were analyzed by capillary-column gas chromatography and electron capture detection. In this paper the method has been applied to 12 pesticide residues belonging to the pyrethroid family: l-cyhalothrin-1, l-cyhalothrin-2, cis-permethrin, trans-permethrin, cypermethrin-1, cypermethrin-2, cypermethrin-3, cypermethrin-4, fenvalerate-RS/SR, fenvalerate-SS/RR, deltamethrin-cis and deltamethrin-trans. Validation tests were carried out to assess recoveries and repeatability of the method for the twelve target compounds, at various levels of concentrations. Then limits of detection and quantification of the method were determined and will be reported. The advantage of this method is the quick extraction procedure that permits good recovery rates.