Propamocarb

The pesticidal standards (100 mg/kg) for Thiamethoxam, Propamocarb, Carbaryl, Metalaxyl, Baycarb, Thiobencarb, Diazinon, and Dursban were obtained from AccuStandard ® (New Haven, USA) and were later diluted to 0.1 mg/kg (100 µg/kg) with estimated volume of methanol, respectively. Meanwhile, the LC-MS grade organic solvents were used for this research work. The solvents include methanol and ACN (Merck, Germany), acetic acid (HOAc), and formic acid were obtained from Fisher Scientific. The Millipore-filtered (deionized) water was obtained using Merck Millipore water purification system (Billerica, USA). The ProElut TM AOAC 2007.01 QuEChERS-dSPE kits for general vegetables and fruits were obtained from Dikma Technologies Inc. (Lake Forest, USA), as well as the molten salt (HPLC grade) of [C6MIM][PF6] ionic liquid-based (P ≥ 97.0%) was purchased from Sigma-Aldrich, (Germany).

The chemicals and reagents such as the stock standard solution (100 mg/kg) for pesticide Baycarb, Carbaryl, Diazinon, Dursban, Metalaxyl, Propamocarb, Thiamethoxam and Thiobencarbwere were purchased from AccuStandard ® (New Haven, USA). The LC-MS grade organic solvents that include ACN and methanol were purchased from Merck (Germany). The formic acid was purchased from Fisher Scientific. The Millipore-filtered (deionized) water was obtained using Merck Millipore water purification system (Billerica, USA). While, the apparatus and equipments that include the 100 and 500 µL microsyringe were purchased from Agilent (Australia). The pH meter PB was purchased from Sartorius group (Germany). The HPLC autosampler vials were purchased from Agilent Technologies (USA). The Supelco HPLC column [Ascentis ® Express C18 (5 cm x 2.1 mm, 2.7 µm)] was purchased from Sigma-Aldrich (USA). And the liquid chromatography-tandem mass spectrometry (LC-MS/MS) [triple quadrupole (G6490A) built in Electrospray ESI (±) MS/MS Sensitivity and Jet stream Technology] instrument was purchased from Agilent (Singapore).