An environmentally friendly, simple and novel microextraction procedure for copper at trace level from urine, sweat, dialysis solution and water samples before its FAAS detection

In order to determine copper at trace level by flame atomic absorption spectrometry (FAAS), a supramolecular solvent-based liquid-phase microextraction method has been developed. 1-(2-pyridylazo)-2-naphthol (PAN) was used as a chelating agent to obtain the copper complex. In this method, supramolecular solvent was prepared by using tetrahydrofuran (THF) and decanoic acid. pH, THF volume, amount of decanoic acid, amounts of chelating agent, ultrasonic bath and centrifugation time, matrix effects and sample solution volume parameters which were effective on the recovery of the method were optimised. The detection limit (LOD) and quantification limit (LOQ) were 7.30 mu g/L, 24.2 mu g/L, respectively. The preconcentration factor was found to be 40. The accuracy of the method was determined by analysing TMDA 53.3 and TMDA 64.2 certified reference materials and some addition recovery tests. The presented method was applied to urine, sweat, dialysis solution and water samples to determine their copper level by flame atomic absorption spectrometry (FAAS)

A novel ultrasonication-assisted deep eutectic solvent microextraction procedure for tartrazine at trace levels from environmental samples

A novel deep eutectic solvent microextraction method for traces tartrazine has developed for its separation and preconcentration prior to its determination by UV-Vis spectrophotometry at 430 nm. In order to obtain deep eutectic solvent, tetrabutylammonium bromide and decanoic acid were used. The important analytical parameters such as pH, deep eutectic solvent type, model solution volume, sample volume, and matrix effects are optimized. Tartrazine was quantitatively extracted in the deep eutectic solvent phase at pH 4.0. The limit of detection and preconcentration factor were found as 0.084 mg L-1 and 12.5, respectively. The validation of the procedure was performed by using addition/recovery tests. The method was applied to the determination of tartrazine content of various environmental samples

CuCo2O4 as affective adsorbent for dispersive solid-phase extraction of lead from food, cigarette and water samples before FAAS detection

CuCo2O4 nanoparticle has been synthesized, characterized and firstly used as solid-phase extractant for the dispersive solid-phase extraction of Pb(II) in the presented work. The important parameters like pH of the working media, type of eluent solution and its volume, adsorbent amount, adsorption-desorption contact times, sample volume have been optimized. Lead (II) ions were quantitatively recovered on CuCo2O4 nanoparticle at pH 6.0 with 10 mg of adsorbent and eluted by using 2 mL of 1 M HCl. The influences of some cations and anions on the recoveries were also investigated. While the preconcentration factor was 25, the limit of detection was calculated as 6.5 mu g/L. The method was checked by applying the method to certified reference material (TMDA-53.3). The method was successfully applied to various food, cigarette and water samples

Spectrophotometric determination of traces allura red in environmental samples after a deep eutectic solvent-based microextraction

A new method has been developed based on UV-Vis spectrophotometer measurement after liquid-phase microextraction using deep eutectic solvents for the determination of allura red dye. Tetra-n-butyl ammonium bromide and decanoic acid were used as deep eutectic solvent components by the developed method. The effects of the method on recovery, mainly pH, deep eutectic solvent components and volume, tetrahydrofuran volume, matrix effects, model solution volume, ultrasonication time and centrifugation time were also investigated. Allura red was extracted into the deep eutectic solvent phase at pH 4.0. The relative standard deviations were lower than 5%. The limit of detection (LOD) and preconcentration factor were found to be 3.92 mu g/L and 13, respectively. The accuracy of the method was confirmed by the addition method on water, detergent and chocolate samples