Analysis of Carbaryl and carbofuran in tobacco samples by HRGC, HPLC, and CZE

Determination of carbamate residues in tobacco samples was carried out by three different methods, two having been described in the literature and one developed for the purpose of this work. The extracts were analyzed by HRGC‐FID (using derivatization), by HPLC‐RP with photodiode array detection and by Capillary Zone Electrophoresis (CZE) with UV detection. The extraction method developed used in conjunction with capillary zone electrophoresis showed to be the most suitable for carbamate residue analysis in real tobacco samples. The developed method presented better recovery results in relation to the others. CZE allowed the determination of carbamate residue in real tobacco sample while HPLC and HRGC could not do this, due to co‐elution problems.