This work describes a new extraction method with hollow-fiber liquid-phase microextraction based on facilitated pH gradient transport for analyzing hippuric acid and mandelic acid in aqueous samples. The factors affecting the metabolites extraction were optimized as follows: the volume of sample solution was 10 mL with pH 2 containing 0.5 mol·L-1 sodium chloride, liquid membrane containing 1-oc...

A new format of fast three-phase microextraction by combining low-density solvent-based dispersive liquid-liquid microextraction (DLLME) and single-drop microextraction (SDME) was for the first time developed for the determination of chlorophenols in environmental water samples. The extraction procedure includes a 2 min DLLME pre-extraction and a 10 min SDME back-extraction. A portion of low-de...

A simple and rapid microextraction procedure based on dispersive liquid-liquid microextraction (DLLME) coupled with gas chromatography-flame ionization detection (GC-FID) was developed for the extraction and analysis of 2-phenylethanol in rose water sample. In the proposed approach, carbon tetrachloride and ethanol were used as extraction and dispersive solvents, respectively. Some important pa...

Electromembrane extraction (EME) was published for the first time in 2006, and is a liquid-phase microextraction technique intended for analytical sample preparation. In EME, charged analytes are extracted in an electrical field, from the aqueous sample solution, through a supported liquid membrane and into an aqueous acceptor phase. EME is still in an early stage of development, although nearl...

We introduce digital microfluidic interface between solid-phase microextraction (SPME) and liquid chromatography. In the new system, a SPME fiber is used to extract analytes from a complex sample, and is then inserted into a DMF device. Solvent droplets are then used to extract analytes from the fiber with continuous actuation, followed by analysis with liquid chromatography (LC) and mass spect...

A novel method is reported, whereby screen-printed electrodes (SPELs) are combined with dispersive liquid-liquid microextraction. In-situ ionic liquid (IL) formation was used as an extractant phase in the microextraction technique and proved to be a simple, fast and inexpensive analytical method. This approach uses miniaturized systems both in sample preparation and in the detection stage, help...

the task specific ionic liquid (tsil), tricaprylmethylammonium thiosalicylate ([a336][ts]),was synthesized, characterized and subsequently used as extraction solvent in dispersive liquid-liquidmicroextraction (dllme) technique. the tsil-dllme method followed by inductively coupled plasmaatomicemission spectrometry (icp-aes) was applied to determination of trace mercury (hg) and cadmium(cd) in a...