Coordination polymer adsorbent for matrix solid-phase dispersion extraction of pesticides during analysis of dehydrated Hyptis pectinata medicinal plant by GC/MS

The coordination polymer [Zn(BDC)(H 2O) 2] n was tested for extraction of pyrimethanil, ametryn, dichlofluanid, tetraconazole, flumetralin, kresoxim-methyl and tebuconazole from the medicinal plant Hyptis pectinata, with analysis using gas chromatography–mass spectrometry in selected ion monitoring mode (GC/MS, SIM). Experiments carried out at different fortification levels (0.1, 0.5 and 1.0 μg g −1) resulted in recoveries in the range 73–97%, and RSD values were between 5 and 12% for the [Zn(BDC)(H 2O) 2] n sorbent. Detection and quantification limits ranged from 0.02 to 0.07 μg g −1 and from 0.05 to 0.1 μg g −1, respectively, for the different pesticides studied. The method developed was linear over the range tested (0.04–14.0 μg g −1), with correlation coefficients ranging from 0.9987 to 0.9998. Comparison between [Zn(BDC)(H 2O) 2] n and the commercial phase C 18-bonded silica showed good performance of the [Zn(BDC)(H 2O) 2] n polymeric sorbent for the pesticides tested.