A simple and efficient method for speciation and determination of iron in different water samples was developed. The method is based on ionic liquid ultrasound assisted dispersive liquid–liquid microextraction (IL-USADLLME) followed by spectrophotometric determination. Fe(II) is complexed with 2,4,6-tri(2’-pyridyl)-l,3,5-triazine (TPTZ), neutralized through ion pair formation with sodium dodecy...

ABSTRACT. The recent research focused on the green synthesis of silicon dioxide nanoparticles, SiO2@Cellulose Zizyphus Spina-Christi nanocomposites, and L-Arginine@SiO2@Cellulose nanocomposites using cellulose as a new polymeric surfactant. structures nanoparticles were characterized by different spectroscopy microscopy techniques. Nanoparticles utilized to determine concentration chromium, cad...

Ionic liquid (IL) based dispersive liquid-liquid microextraction (DLLME) with back-extraction coupled with capillary electrophoresis ultraviolet detection was developed to determine four phenolic compounds (bisphenol-A, β-naphthol, α-naphthol, 2, 4-dichlorophenol) in aqueous cosmetics. The developed method was used to preconcentrate and clean up the four phenolic compounds including two steps. ...

In this research paper, a simple and economic ionic liquid-based liquid-liquid microextraction (IL-DLLME) procedure was developed to ensure efficient rapid separation preconcentration of erythrosine from cosmetic food samples. Important parameters such as IL volume, temperature, acetone ultrasonic time pH that may affect the IL-DLLME have been optimized by central composite design (CCD) based o...

dispersive liquid-liquid microextraction technique based on solidification of a floating organic drop (dllme-sfo) combined with flame atomic absorption spectrometry was developed for determination of thallium in water sample. an appropriate mixture of acetone and 1-undecanol was rapidly injected into an aqueous sample containing tlcl4- which forms an ion pair with brilliant green reagent and as...

in this work, an environmentally friendly sample pre-treatment method, ultrasound assisted surfactant enhanced emulsification microextraction (uaseme) followed with spectrofluorimetry was performed for determination of oxadiazon residues in water samples. after the determination of the most suitable extraction solvent and its volume, other parameters such as type and concentration of surfactant...

Dispersive liquid-liquid microextraction (DLLME) and spectrofluorimetry, coupled with chemometrics methods, are proposed in this work for the pre-concentration and determination of ofloxacin concentration in spiked human urine. Chloroform and acetonitrile were selected as the extraction and dispersive solvents by the one-variable-at-a-time process. The Box-Behnken design was used to optimize th...

A simple, accurate and fast vortex-assisted dispersive liquid-liquid microextraction procedure has been developed for the extractive spectrophotometric determination of niflumic acid in biological samples. The method is based on the formation of an ion association complex between niflumic acid and methylene blue. The resulting ion-pair was extracted into dichloromethane and its absorbance was m...

This paper describes a dispersive liquid–liquid microextraction (DLLME) procedure using room temperature ionic liquids (RTILs) coupled with flame atomic absorption spectrometry detection with microsample introduction system capable of quantifying trace amounts of lead. In the proposed approach, ammonium pyrrolidine dithiocarbamate (APDC) was used as a chelating agent and 1-hexyl-3-methylimmidaz...

A rapid and sensitive dispersive liquid-liquid microextraction (DLLME) has been developed for the extraction of selected polycyclic aromatic hydrocarbons (PAHs), namely phenanthrene (PHE) fluoranthene (FLA) in green tea beverage samples. The extracted PAHs were separated determined by using high-performance liquid chromatography diode array detection (HPLC-DAD). An experimental design response ...