ISHS Acta Horticulturae 249: International Symposium on Heavy Metals and Pesticide Residues in Medicinal, Aromatic and Spice Plants
RESIDUES OF AZINPHOSMETHYL, CYPERMETHRIN, BENOMYL AND CHLOROTALONIL IN MONARDA AND PEPPERMINT OIL |
| Author: | A. Bélanger |
| Abstract:
Peppermint oil is used as a flavouring agent in food and monarda oil is used in the cosmetics industry. Therefore, residues of pesticide in these oils are undesirable. Two weeks after treatment, residues of azinphosmethyl 50WP applied at 1.1 kg/ha were detected in peppermint and monarda oil. However, at harvest (28 days later) no residue could be detected. Cypermethrin applied at 0.2 l/ha resulted in residue levels of 0.07 ppm in peppermint oil and 0.8 ppm in monarda oil at harvest. Chlorotalonil applied at 2.5 l/ha resulted in 0.44 ppm residues in peppermint oil. In monarda a much lower level of benomyl (0.07 ppm) was detected at harvest. Capillary gas chromatography with direct on column injection, without and clean-up, was used to separate the insecticides and chlorotalonil. Azinphosmethyl was quantified with a NP detector and cypermethrin and chlorotalonil with an EC detector. These methods were sensitive down to the 0.02 ppm level. A method for detecting and measuring benomyl as carbendazim, its most common degradation product, was developed. A cleaned-up sample of oil was analyzed for carbendazim by HPLC using a C-18 reverse phase column. The detection limit for this method was 0.01 ppm. | |
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