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Summary Nowadays, there are not registered plant protection products (PPPs) for use in the cultivation of Jerusalem artichoke in our country. The lack of protection programs makes possible misuse of PPPs in accordance with their labels. Therefore, in order to ensure consumer safety, it becomes necessary to control the residues of PPPs in this plant. The aim of this study was to optimize the multiresidue method based on matrix solid phase dispersion (MSPD) in terms of type of sample weight, sorbent and extracting solvent. Experiments were carried out by fortification of artichoke blank samples with 179 active substances. The optimum parameters were 2 g of a sample with 4 g of florisil as a sorbent. The pesticides were extracted using two solvent mixtures: hexane/acetone (8:2, v/v) and diethyl ether/acetone (8:2, v/v). For clean up glass chromatography column with silica gel was used. Pesticides were analysed by gas chromatography (GC) with dual detection system: electron capture (EC) and nitrogen‐phosphorus (NP). The average recoveries for most compounds were in the range 71.8−117.2% and the relative standard deviations (RSDs) were equal or lower than 19.0%. The method allowed the determination of very low concentration levels (0.005 mg/kg) and has been applied to routine analysis.

Evaluation of multiresidue method for the determination pesticide residues in Jerusalem artichokes (Helianthus tuberosus L.)