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Dispersive liquid–liquid microextraction (DLLME) coupled with gas chromatography-flame ionization detector (GC-FID) was developed for preconcentration and determination of some nitroaromatic compounds in wastewater samples. The effects of different variables on the extraction efficiency were studied simultaneously using experimental design. The variables of interest in the DLLME process were extraction...
In this study a new dispersive liquid–liquid microextraction (DLLME) method is presented on the basis of a safe organic solvent, octanol, which is lighter than water. The proposed method is used for the extraction and pre-concentration of some preservatives including methyl paraben (Mep), ethyl paraben (Etp) and propyl paraben (Prp) from different matrices. The extracted compounds are monitored by...
Supercritical fluid extraction (SFE) combined with dispersive liquid–liquid microextraction (DLLME) followed by gas chromatography with flame ionization detector (GC-FID) was developed for the extraction and determination of 4-nitrotoluene and 3-nitrotoluene in soil sample. The effects of different SFE experimental parameters on the extraction recovery were studied simultaneously using a central composite...
A new method based on simultaneous derivatization and dispersive liquid–liquid microextraction in one step is developed for determination of five anilines in different aqueous samples. In this method, acetonitrile containing microlitre-level of butylchloroformate was rapidly injected into aqueous sample by a syringe. After centrifugation of the cloudy solution, the fine droplets of the butylchloroformate...
In this paper, a new extraction method based on counter current salting-out homogenous liquid–liquid extraction (CCSHLLE) followed by dispersive liquid–liquid microextraction (DLLME) has been developed for the extraction and preconcentration of widely used pesticides in fruit juice samples prior to their analysis by gas chromatography–flame ionization detection (GC–FID). In this method, initially,...
A new sample preparation method based on liquid–liquid–liquid extraction combined with dispersive liquid–liquid microextraction followed by gas chromatography–flame ionization detection has been reported for the extraction/preconcentration and determination of trace levels of twelve pesticide residues from different samples with high content of solids without filtration. This method consists of a...
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