Research Article
Detection of Organophosphorus Pesticides in Wheat by Ionic Liquid-Based Dispersive Liquid-Liquid Microextraction Combined with HPLC
Figure 5
Effects of [OMIM][TF2N] volume on EFs (a) and ERs (b). Extraction conditions: solvent, methanol; solvent volume, 1 mL; extractant, [OMIM][Tf2N]; extractant volume, 18 L, 20 L, 22 L, 24 L, and 26 L, respectively; extraction temperature, room temperature; ultrasonic time, 8 min; centrifugal time, 5 min.
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| (b) |