Determination of ultratrace amounts of dichloro-nitrobenzene and dichloro-nitroaniline in water samples using solidified floating organic drop microextraction (SFODME) and gas chromatography

摘要

Solidified floating organic drop microextraction (SFODME) incombination with gas chromatography with an electron capture detectorwas used for separation/enrichment and determination of2,5-dichloro-nitrobenzene, 2,3-dichloro-nitrobenzene, and2,6-dichloro-4-nitroaniline in water samples. The main parametersaffecting the performance of SFOME, such as solvent volume, extractiontime, stirring rate, extraction temperature, sample volume, nature ofthe solvent and ionic strength were optimized. Under the optimumexperimental conditions, good relative standard deviations of 7.5%,6.9%, and 9.3% for 7 extractions and determination of 50 ng L^{-1}of 2,5-dichloro-nitrobenzene, 2,3-dichloro-nitrobenzene and2,6-dichloro-4-nitroaniline were obtained, respectively. Enrichmentfactors of 1390, 1398, and 1362 and detection limits of 1.4, 1.2, and10 ng L^{-1} for 2,5-dichloro-nitrobenzene, 2,3-dichloro-nitrobenzene,and 2,6-dichloro-4-nitroaniline were found, respectively.