Determination of Rhodamine B by UV-Vis spectrophotometry in cosmetics after microextraction by using heat-induced homogeneous liquid-liquid extraction method

An environmentally friendly microextraction method which includes determination of trace levels of rhodamine B in cosmetic and detergent samples by using UV-vis spectrophotometric determination after enrichment with has been established heat-induced homogeneous liquid-liquid microextraction method. As extraction solvent, cyclohexylamine has been used, and the rhodamine B concentration in extraction phase was determined at 550 nm by using UV-vis spectrophotometry. The major parameters influencing in the method including pH, volume of cyclohexylamine, amount of NaCl, sample volume have been assessed. The influences of the matrix components were also investigated. The limit of detection, the limit of quantitation and linear range were found as 0.014, 0.047 and 0.047-4.79 mu g mL(-1), respectively. The relative standard deviation was 1.03%. The extraction procedure was applied to determination of rhodamine B in the cosmetic and detergent samples

Magnetic Solid Phase Extraction of Trace Lead and Copper on Chromotrope FB Impregnated Magnetic Multiwalled Carbon Nanotubes From Cigarette and Hair Samples for Measurement by Flame AAS

A novel and simple magnetic solid phase extraction procedure for the separation-preconcentration of lead(II) and copper(II) at trace levels has been established by using Chromotrope FB impregnated magnetic multiwalled carbon nanotubes as a new adsorbent. The influences of critical analytical parameters like pH, flow rates, eluent, and sample volume were optimized. Matrix effects were also examined. Analyte elements were quantitatively recovered at pH 6.0. The limit of detection values were 11.7 mu g L-1 for lead and 3.7 mu g L-1 for copper. The (%) RSD values were generally found at < 7%. The validation was performed by the analysis of NCS-DC73349 Bush Branches and Leaves certified reference material. The method was applied to the FAAS determination of lead and copper concentrations in cigarette and hair samples

A green and simple liquid-phase microextraction based on deep eutectic solvent for the erythrosine prior to its UV-VIS spectrophotometric detection

A simple, sensitive, effective and rapid liquid-phase microextraction (LPME) method based on deep eutectic solvent (DES) was developed for the preconcentration and determination of erythrosine in the drug, water and powdered fruit juice samples prior to its UV-VIS spectrophotometric determination. In the DES-LPME study, the analytical parameters affected on extraction efficiency of the analyte were optimized. Under the optimum experimental conditions, the limits of detection and limit of quantification were obtained as 0.53 mu g L-1 and 1.78 mu g L-1, respectively. The preconcentration factor was calculated as 100. Accuracy of the proposed microextraction method has been checked by analyzing the addition-recovery studies to in real samples and satisfactory results were obtained

Hydrolytic enzyme modified magnetic nanoparticles: An innovative and green microextraction system for inorganic species in food samples

© 2021 Elsevier B.V.In the presented study, the usability of hydrolytic enzyme immobilized magnetic nanoparticles as an extraction agent for the microextraction of metal ions from food samples was investigated. α-amylase modified magnetic carbon nanotubes (α-amylase-Fe3O4/MWCNTs) was used as an extraction agent for direct microextraction of trace arsenic from food sample phase into liquid phase medium prior to its ICP-MS determination. In extraction studies using hydrolytic enzymes, it is impossible to recover the free soluble enzyme after extraction without losing its activity. In our study, this problem was overcome by immobilizing the hydrolytic enzyme on magnetic support. In this way, α-amylase-Fe3O4/MWCNTs as an extraction agent with a reuse property of at least six times was used. α-amylase-Fe3O4/MWCNTs was characterized by FT-IR, XRD, SEM, SEM-EDX, VSM, TGA, and DTG techniques. Optimization of the presented method was performed using 1568 A rice flour certified reference material. Analytical parameters such as type of hydrolytic enzyme, pH and volume of the aqueous phase, extraction temperature and ultrasonic irridation time were optimized. The microextraction step was performed in ultrasonic water bath within only ∼15 min. Limit of detection (LOD), limit of quantification (LOQ) and relative standard deviation (RSD %) values for the developed method were found to be 14.3 μg kg−1, 47.3 μg kg−1 and 7.5%, respectively. The method was successfully applied to the analysis of arsenic contents of different rice and flour samples

Ultrasound-assisted magnetic solid phase microextraction of patent blue V on magnetic multiwalled carbon nanotubes prior to its spectrophotometric determination

An ultrasound-assisted magnetic solid phase microextraction procedure was developed for separation and enrichment of trace levels of patent blue V in different syrups, waters and artificial sweat samples prior to its determination by UV-Vis spectrophotometry. Three mg magnetic multiwalled carbon nanotube (mMWCNT) was used as solid phase. Several variables affecting microextraction efficiency such as sample volume, pH, matrix effect, volume and type of eluent, sample volume were investigated and optimized. The developed SPME method presents a limit of detection (LOD, N = 10) of 3,5 mu gL(-1), analyte recoveries were 98-100%, pre concentration factor of 250 and a relative standard deviation (RSD, %, N = 10) of 1,5% under the optimum conditions. The proposed procedure for determination of patent blue V in different environments samples is precise, accurate, very simple, practical, fast, easy to apply and economical

Layered Double Hydroxides (LDHs) for the Treatment and Determination of Pollutants in Water and Wastewater

Detection and removal of trace amounts of toxic organic and inorganic pollutants in water and wastewater is important for the entire ecosystem. The development of new materials for the determination and removal of contaminants is constantly necessary. Layer double- hydroxides (LDHs) form a broad class of nanomaterials that represent anionic clay composite material used in research and development applications to protect the environment from pollutants. LDH structures functionalized with carbon-based materials are promising adsorbents in the extraction of organic and inorganic pollutants through adsorption and ion exchange mechanisms due to their increased versatility. This review describes recent studies on carbon-containing structure-based LDH composites used in the determination and removal of organic and inorganic pollutants in water and wastewater. Thus, it will lead to the realization of new studies for the determination and removal of different pollutants in other matrices besides water samples of LDHs

A novel-easy deep eutectic solvent-based microextraction procedure for the separation, preconcentration and spectrophotometric determination of chromotrope 2R in water, detergent and food samples

An efficient and simple deep eutectic solvent (DES)-based liquid phase microextraction method has been used for chromotrope 2R dyestuff at trace levels prior to its UV-Vis spectropthometric determination. In this aspect, DES was prepared by decanoic acid and tetra-n-butylammonium bromide component used as 1:3 molar ratios. The developed separation-preconcentration method was optimised various analytical parameters such as pH, sample volume, eluent sample volume, volume of DES, sample volume of tetrahydrofuran (THF) and matrix effect etc. on the recovery of chromotrope 2R dyestuff were investigated. Quantitative recovery data for chromotrope 2R were found at pH 3.0. The detection limits of the chromotrope 2R were found to be as 5.4 mu g L-1. The accuracy of the developed method was successfully applied by the determination of the addition-recovery studies in the water sample, detergent and food samples with satisfactory results. The proposed method was applied to natural water samples for the determination of chromotrope 2R with satisfactory results

Ligandless reversed-phase switchable-hydrophilicity solvent liquid-liquid microextraction combined with flame-atomic absorption spectrometry for the determination of copper in oil samples

A novel ligandless reversed-phase switchable-hydrophilicity solvent liquid-liquid microextraction method is proposed for the determination of copper in oil samples using flame-atomic absorption spectrometry. Optimum extraction conditions were achieved using 500 mu L of triethylamine as the extraction solvent, 750 mu L of 7.5 M nitric acid as a hydrophilicity-switching trigger, 30 mL of the oil sample and 5 min extraction time. Limits of detection and quantitation were found as 6.9 and 23.0 ng mL(-1), respectively. Good linearity was obtained with a coefficient of determination (R-2) value of 0.9998 and a preconcentration factor of 22.7. Intraday and interday precision, expressed as percentage relative standard deviations (%RSD), were less than 4.7 and 9.4%, respectively. Accuracy was checked by addition-recovery studies and percentage recoveries within the range of 85-100% were obtained. The proposed method was successfully applied to determine copper ion in edible oil samples (i.e., sunflower, olive, flaxseed and corn) and baby oil and satisfactory results were achieved

Fe3O4@SiO2@Bacillus pumilis: magnetised solid phase bio-extractor for preconcentration of Pb(II) and Cu(II) from water samples

In this study, preconcentration and separation of Cu(II) and Pb(II) ions by using Fe3O4@SiO2@Bacillus pumilis before their determinations by flame atomic absorption spectrometry (FAAS) were investigated. The thermophilic Bacillus pumilis were isolated from Meyremderesi spring, Sirnak, Turkey. Effects of important parameters such as pH, adsorbent amount, eluent type, concentration and volume of eluent and sample volume on magnetic solid phase extraction (MSPE) were examined in details. The preconcentration factors for Cu(II) and Pb(II) ions were calculated as 30 and 40, respectively. The accuracy of the proposed extraction procedure was validated analysing certificated reference materials and addition - recovery tests. The concentration of copper and lead were determined in water samples from Turkey by Flame AAS after application developed preconcentration-separation method

Deep eutectic solvent based liquid phase microextraction of nickel at trace level as its diethyldithiocarbamate chelate from environmental samples

A new and green deep eutectic solvent based liquid phase microextraction procedure (DES-LPME) has been developed for separation and preconcentration of nickel prior to micro-sampling flame atomic absorption spectrometric determination (MS-FAAS). Ni(II) was complexed with sodium diethyldithiocarbamate (NaDDTC) and was extracted to micro-volume DES phase. In this regard, tetra butyl ammonium chloride-decanoic acid component as 1:3 molar ratios was used to prepare DES. Analytical parameters such as pH of sample solution, sample volume, volume of DES and matrix effect that would affect the recoveries of nickel(II) were optimized. Quantitative recovery values for Ni(II) ions were obtained at pH 3.0. The preconcentration factor (PF) was calculated as 60. The limit of detection (LOD) and limit of quantification (LOQ) were determined to be as 0.13 mu g L-1 and 0.43 mu g L-1 respectively. The relative standard deviation (% RSD) was 3.2%. The validation of the developed method was proved by the analysis of the certified water reference materials and addition-recovery test. The presented deep eutectic solvent based liquid phase microextraction method (DES-LPME) was successfully applied for determination of nickel in some water and food samples from Turkey