Dispersive Liquid-Liquid Microextraction Combined with Ultrahigh Performance Liquid Chromatography/Tandem Mass Spectrometry for Determination of Organophosphate Esters in Aqueous Samples

<table>Selected ion chromatograms of the mixed standard solution of OPEs (5.0 <i>μ</i>g/L) and internal standard TBP-d27 (20.0 <i>μ</i>g/L).</table>

The Scientific World Journal

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Figure 8

Figure 8: Dispersive Liquid-Liquid Microextraction Combined with Ultrahigh Performance Liquid Chromatography/Tandem Mass Spectrometry for Determination of Organophosphate Esters in Aqueous Samples 

Figure 8 | Dispersive Liquid-Liquid Microextraction Combined with Ultrahigh Performance Liquid Chromatography/Tandem Mass Spectrometry for Determination of Organophosphate Esters in Aqueous Samples 