a simple and rapid microextraction procedure based on dispersive liquid-liquid microextraction (dllme) was developed for determination and speciation of trace amounts of chromium (cr) by flame atomic absorption spectrometry (faas). in the proposed approach, chloroform and methanol were used as extraction and dispersive solvents. a new schiff's base ligand, bis(2-methoxy benzaldehyde) ethylene d...

in this study, a sensitive method of dispersive liquid phase microextraction based on ion-pair combined with the flame atomic absorption spectrometry was proposed for the determination of trace ni(ii) using aliquat 336-chloride as ion pair agent. several factors which have effect on  the microextraction efficiency of ni(ii), such as ph, extraction and dispersive solvent type and their volume, c...

In this work, two approaches based on Dispersive Liquid-Liquid MicroExtraction (DLLME) and Dispersive Liquid-Liquid MicroExtraction based on Solidification of Floating Organic Drop (DLLME-SFO) were compared for the extraction and preconcentration of crocin from saffron and biological samples. Different DLLME and DLLME-SFO parameters influencing the extraction efficiency were studied and opt...

Liquid-liquid extraction or solid-phase extraction followed by gas chromatography (GC) or high-performance liquid chromatography are traditional herbicide residue determination methods for environmental samples. Solid-phase microextraction (SPME) is a solventless, fast, and sensitive alternative herbicide residue extraction method that can be applied to numerous environmental matrices. The obje...

Magnetic deep eutectic solvents (MDESs) have recently produced a torrent of pioneering applications in endless areas sample preparation. By including magnetic nanomaterial (e.g., nanoparticles) or paramagnetic anion [FeCl4]-) their structure, MDESs exhibit strong response under the application an external field. Furthermore, use MDESs, as sorbent solvent extraction techniques, been scarcely emp...

A new method of offline solid-phase microextraction coupled with capillary electrophoresis (CE) [in an uncoated capillary using borax and boric acid in acetonitrile-water (40:60) as the running buffer] with UV detection at 254 nm is presented and used for direct determination of trace biomedically important retinoic acid (RA) without any derivation. As low as 138 ng/mL RA in aqueous solution ca...