Fig. 3. The electropherograms of a mixed standard solution (10 mg/L, for each analyte) and a typical sample solution (Bread 1#). Separation conditions: 1% (w/v)
copolymer + 20 mM borax buffer (pH 9.2) for determination of DMP, DMEP, DEP, DEEP in the mixed standard solution (a) and in the sample solution (b); 1% (w/v)
copolymer + 5 mMborax buffer (pH 9.2) + 2% (v/v) 1-butanol and 40% (v/v) methanol for determination of the other 11 kinds of PAEs in the mixed standard solution (c), in the
sample solution (d), and in the sample spiked with 10 mg/L mixed standard solution. The other conditions were the same as in Fig. 1.