We demonstrated a method which on-line coupled SDME and
CE with IL as an extraction solvent without any alteration on
instrument. Based on Ref. [17], the procedures of IL-SDME–CE
were proposed which were shown in Fig. 1(a). Firstly, capillary
was flushed with 20mmolL−1 borate (pH 10.0) including 66.7%
methanol (v/v) for 2min.