Chlorantraniliprole

Reference materials (RM) for etofenprox (purity > 99.0%), hexaconazole (purity > 98.7%), and propiconazole (purity > 98.5%) were obtained from Dr. Ehrenstrofer GmbH (Augsburg, Germany) and were weighted with precision balance (New Jersey, US) to prepare stock solution. Azoxystrobin, clothianidin, chlorantraniliprole, dinotefuran, (E)-ferimzone, (Z)-ferimzone, and 1000 mg/L stock solution were obtained from Accustandard (New Haven, USA). LiChrosolv-grade acetonitrile and methanol were secured from Merk (Darmstadt, Germany). QuEChER EN packet (Cat No. 5982-5650) and dispersive-SPE (Cat No. 5982-5021) were obtained from Agilent Technologies (California, US). Deionized water was used along with Autwomatic Plus 1 + 2 from Waaserlab (de Navarra, Spain). Formic acid (purity > 98.0%) was secured from Merk (Darmstadt, Germany). The extract machine used was the 2010 Geno/Grinder from SPEX SamplePrep (Metuchen, US), and the vortex mixer was Vortex-Genie 2 from Scientific industry (New York, US). Finally, the centrifuge was from Hanil Science (Incheon, Korea).

Lufenuron (purity: 100%), the pesticide standard, was provided by the Institute of Kemidas (Gyeonggi-do, Gunpo-si, South Korea). The purities of the nine pesticide standards (azoxystrobin, chlorantraniliprole, chlorfenapyr, diniconazole, fludioxonil, imidacloprid, indoxacarb, pyraclostrobin, and thiamethoxam) ranged from 98 to 100%; these standards were obtained from Accustandard (New Haven, CT, USA).