A very simple, rapid and sensitive dispersive liquid-liquid microextraction (DLLME) followed by gas chromatography and flame ionization detection (GC-FID) was developed for the determination of phenol and carvacrol in honey samples. A mixture of 100 µl dichloromethane (extraction solvent) and 0.5 ml acetonitrile (disperser solvent) was rapidly injected into sample solution. Thereby a cloudy sol...

Liquid chromatography electrospray ionization mass spectrometry is a very powerful technique that combines the liquid chromatography separation with highly selective and sensitive mass detection, but the ionization process is susceptible to matrix signal suppression. Signal suppression, therefore, presents a challenge in doing quantitative liquid chromatography/mass spectrometry applications. U...

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...

Increasing research efforts have been recently devoted to the coupling of microfluidic chip-integrated ionization sources to mass spectrometry (MS). Considering the limitations of microfluidic chips coupled with MS such as liquid spreading, dead volume, and manufacturing troubles, this paper proposed a new three-dimensional (3D) flow focusing (FF)-based microfluidic ionizing source. This source...

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...

a very simple, rapid and sensitive dispersive liquid-liquid microextraction (dllme) followed by gas chromatography and flame ionization detection (gc-fid) was developed for the determination of phenol and carvacrol in honey samples. a mixture of 100 µl dichloromethane (extraction solvent) and 0.5 ml acetonitrile (disperser solvent) was rapidly injected into sample solution. thereby a cloudy sol...

From an analysis of electron pulses in liquid argon produced by a particles the average energy required to form an ion pair is evaluated, assurmng JaEk’s theory of columnar recombination is valid. The mean value of 26.0 ev found in this way agrees well with the corresponding value of 26.4 ev for a particles m argon gas. Application of Jaffk’s theory to the liquid state is discussed, and from th...