This article presents the designing and fabrication of a microfluoidic chip with an integrated supported-liquid-membrane extraction-back-extraction and chip-based capillary electrophoresis system(SLMEBE-CCE).A 3-dimen...This article presents the designing and fabrication of a microfluoidic chip with an integrated supported-liquid-membrane extraction-back-extraction and chip-based capillary electrophoresis system(SLMEBE-CCE).A 3-dimensional channel network for the SLMEBE-CCE system was fabricated with a four-layer glass/PTFE-membrane hybrid structure. With a gravity pump for sample and back-extraction solution delivery and a multi-channel high-voltage supply for CCE separation,the microchip with the coupled SLMEBE-CCE system was demonstrated by the pre-concentration,separation and detection of a mixed solution of fluorescein and butyl-rhodamine B.Compared to chip-based CCE without SLMEBE,the developed SLMEBE-CCE system produced a 7-fold increase in the signal of the model analyte of fluorescein and a 4-fold decrease in the signal of the model co-existing compound of butyl-rhodamine B.展开更多
The new combined method of the online liquid membrane enrichment flow injection of 4-amino-antipyrine(4-AAP) and spectrophotometric determination of volatile phenols in water has been developed.A flow carrier,tributyl...The new combined method of the online liquid membrane enrichment flow injection of 4-amino-antipyrine(4-AAP) and spectrophotometric determination of volatile phenols in water has been developed.A flow carrier,tributyl phosphate(TBP) dissolved in kerosene,was used in the liquid membrane extraction system.Experiment conditions were optimized.Under optimal conditions,the detection limit for volatile phenols is 0.5 μg/L and the linear range of the determination is 1mg/L~100μg/L.The method has been applied to the determination of volatile Phenols in tap,river and industrial waste water with satisfactory results.展开更多
文摘This article presents the designing and fabrication of a microfluoidic chip with an integrated supported-liquid-membrane extraction-back-extraction and chip-based capillary electrophoresis system(SLMEBE-CCE).A 3-dimensional channel network for the SLMEBE-CCE system was fabricated with a four-layer glass/PTFE-membrane hybrid structure. With a gravity pump for sample and back-extraction solution delivery and a multi-channel high-voltage supply for CCE separation,the microchip with the coupled SLMEBE-CCE system was demonstrated by the pre-concentration,separation and detection of a mixed solution of fluorescein and butyl-rhodamine B.Compared to chip-based CCE without SLMEBE,the developed SLMEBE-CCE system produced a 7-fold increase in the signal of the model analyte of fluorescein and a 4-fold decrease in the signal of the model co-existing compound of butyl-rhodamine B.
文摘The new combined method of the online liquid membrane enrichment flow injection of 4-amino-antipyrine(4-AAP) and spectrophotometric determination of volatile phenols in water has been developed.A flow carrier,tributyl phosphate(TBP) dissolved in kerosene,was used in the liquid membrane extraction system.Experiment conditions were optimized.Under optimal conditions,the detection limit for volatile phenols is 0.5 μg/L and the linear range of the determination is 1mg/L~100μg/L.The method has been applied to the determination of volatile Phenols in tap,river and industrial waste water with satisfactory results.