Evaluation of a novel microextraction technique for aqueous samples: porous membrane envelope filled with multiwalled XXXX nanotubes coated with molecularly imprinted polymer.

@entity21750 @entity1042 @entity7502 @entity8336 @entity505 @entity25730
A novel microextraction technique based on membrane-protected multiwalled @entity505 nanotubes coated with molecularly imprinted polymer (MWCNTs-MIP) was developed. In this technique, MWCNTs-MIP were packed inside a @entity7502 membrane envelope, which was then clamped onto a paper clip. For extraction, the packed membrane envelope was first impregnated with @entity8336 and then placed in sample solutions. Target analytes in the solutions were first extracted into @entity8336 in the membrane envelope, and were then extracted specifically onto the MWCNTs-MIP. After the extraction, target analytes were desorbed in @entity1042 for liquid chromatography analysis. MWCNTs-MIP of prometryn were used as a model to demonstrate the feasibility of this novel microextraction technique. Factors affecting the extraction including organic solvent, stirring rate, extraction time, salt concentration, and pH were investigated. Under the optimized conditions, the limits of detection (a signal-to-noise ratio of 3) for the selected @entity21750 herbicides were 0.08-0.38  g/L. The prepared membrane envelope could be used at least 50 times. The developed method was used for the analysis of the @entity25730 spiked in river water, wastewater, and liquid milk, with recoveries ranging from 79.3-97.4, 58.9-110.3 and 76.2-104.9%, respectively.
