科研之友
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摘要
The method of liquid-phase microextraction assisted with voltage was developed and applied on determination of sulfonamides in water samples. Four analytes, such as sulfamethazine, sulfathiazole, sulfadimethoxine, and sulfamethoxazole were extracted from a sample solution at pH 4.5 through a polypropylene membrane of immobilized with 2-octanone, and then into 25 L of the acceptor phase of 10 mM sodium hydroxide, and applied voltage of 100 V. Subsequently, the acceptor solution was directly subjected to analysis by LC-MS or capillary zone electrophoresis. Linearity was obtained in the range of 1.0-25.0 ng mL(-1) with R-2 > 0.992 in LC-MS, and 50-1000 ng mL(-1) with R-2 > 0.995 in capillary zone electrophoresis. The development of VA-LPME was also applied in analysis of sulfonamides in water samples to evaluate its practical applicability.
- 出版日期2013-12
