Research Article
Detection of Organophosphorus Pesticides in Wheat by Ionic Liquid-Based Dispersive Liquid-Liquid Microextraction Combined with HPLC
Figure 4
Effects of IL species on EF (a) and ER (b). Extraction conditions: solvent, methanol; solvent volume, 1 mL; extractant, [OMIM][Tf2N], [HHIM][Tf2N], and [BeOIM][Tf2N], respectively; extractant volume, 22 L; extraction temperature, room temperature; ultrasonic time, 8 min; centrifugal time, 5 min.
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