Determination of phthalate acid esters in soybean milk using dispersive liquid–liquid microextraction coupled with gas chromatography and mass spectrometric detection

with the correlation coefficients of 0.9993-0.9998. The precision of the method was 2.9-3.2 in terms of RSD% based on triplicate measurements. The preconcentration factors were in the range of 200-260. The recoveries of eight PAEs were in the range from 79.0 to 110% at three spiked levels. The trace PAEs in five different brands of soybean milk purchased from the market were determined successfully.