Abstract
A method based on dispersive liquid-liquid microextraction-gas chromatography-mass spectrometry (DLLME-GC-MS) was developed for the simultaneous determination of trace 2,4-dinitrotoluene (2,4-DNT) and tris(2-chloroethyl) ester (TCEP) in environmental water samples. The types of extraction solvent, dispersive solvent, extraction time and ionic strength were investigated and optimized to obtain the best extraction efficiency for the target analytes. The analysis performance evaluation and the real sample analysis were performed as follows: 0.8 mL of ethanol as dispersive solvent and 60 microL of chloroform as extraction solvent were rapidly added into 5.0 mL of the aqueous solution, and the solution was vibrated about 120 s and centrifuged. Then the sediment phase to be analyzed was directly injected into a GC-MS. Under the optimized conditions,, the limits of detection (LODs, S/N = 3) for the target analytes were 0.01 microg/L and 0.04 microg/L with the enrichment factors (EFs) of 96.6 and 127.5. The real environmental water samples were analyzed and the recoveries of 102.1% - 110.9% were obtained. The method is simple, fast, efficient and inexpensive.
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