Recent advances in coupling single-drop and dispersive liquid–liquid microextraction with UV–vis spectrophotometry and related detection techniques

Andruch, Vasiľ; Kocúrová, Lívia; Balogh, Ioseph S.; Škrlíková, Jana

doi:10.1016/j.microc.2011.10.006

Cited by 85 publications

(30 citation statements)

References 55 publications

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“…On the other hand, there is a possibility that these polar target analyte molecules participated in electrostatic interactions with the salt ions in the solution and thus caused the polar molecules to precipitate. 28 This process could block the analytes from being extracted into the extractant. Thus, the initial increase of salt concentration could improve the extraction efficiency, but worsen with a further increase of salt concentration.…”

Section: Effect Of Ionic Strengthmentioning

confidence: 99%

“…DLLME can be combined with techniques such as ultraviolet-visible light (UV-Vis) spectrophotometry, gas chromatography and high performance liquid chromatography. [27][28][29][30] Recently, ion mobility spectrometry (IMS) has become a serious alternative to the traditional methods used for detection purposes. IMS is an analytical technique based on the gas-phase separation of ionized compounds under an electric field at ambient pressure by their mobility in the drift gas.…”

Section: Introductionmentioning

confidence: 99%

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Rapid and Highly Sensitive Determination of Melamine in Different Food Samples by Corona Discharge Ion Mobility Spectrometry after Dispersive Liquid-Liquid Microextraction

Mirzajani¹,

Tavaf²

2016

Journal of the Brazilian Chemical Society

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In this work, for the first time, a highly sensitive method based on dispersive liquid-liquid microextraction coupled with positive corona discharge ion mobility spectrometry as a fast and inexpensive technique has been evaluated for the direct determination of melamine. The effective parameters influencing the microextraction efficiency, such as pH, the properties of extraction and dispersion solvent were investigated. Under the optimum conditions, analytical parameters such as linearity, precision and limit of detection were evaluated. The calibration graph of melamine determination using the proposed method has two regions of linearity from 0.5 to 70 ng mL -1 and 70 to 1500 ng mL -1 , the limit of detection and limit of quantification are 0.25 and 0.5 ng mL -1 , respectively, and the relative standard deviation was less than 3% for all experiments. The proposed method was successfully applied for the determination of melamine in the milk, dairy products and egg yolk.

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Section: Effect Of Ionic Strengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rapid and Highly Sensitive Determination of Melamine in Different Food Samples by Corona Discharge Ion Mobility Spectrometry after Dispersive Liquid-Liquid Microextraction

Mirzajani¹,

Tavaf²

2016

Journal of the Brazilian Chemical Society

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“…Over the years, UV-Vis spectrophotometry has been widely used for the determination of metals [2][3][4][5][6], because it is an available and inexpensive technique which can be found in most laboratories. However, due to low concentration of heavy metals, insufficient sensitivity of the instrument, and matrix interferences, there are some difficulties for determination of traces of such analytes using this technique.…”

Section: Introductionmentioning

confidence: 99%

Determination of Zinc, Copper, and Mercury in Water Samples by Using Novel Micro Cloud Point Extraction and UV-Vis Spectrophotometry

Ghasemi¹,

Kaykhaii²

2016

Eurasian J Anal Chem

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A novel micro cloud point extraction (MCPE) was developed as a fast, simple, and economical preconcentration method for spectrophotometric determination of Zn, Cu, and Hg in water samples. In contrary to traditional cloud point extraction, this method does not need heating. To achieve the cloud point in room temperature, the MCPE procedure was carried out in brine. Triton X-114 was employed as a non-ionic surfactant and the analytes were chelated by 4-(2-pyridylazo) resorcinol prior to extraction. The important factors influencing the extraction efficiency were investigated and optimized. Under the optimized condition, calibration curve was found to be linear in the concentration range of 0.15-0.60, 0.02-0.10, and 0.30-0.80 mg.L -1 for Zn, Cu, and Hg respectively with a limit of detection of 51.7, 9.8, and 13.1 μg.L -1 .

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“…15,16 However, most of these techniques suffer from the disadvantages of being time-consuming, using large amounts of toxic organic solvents and being relatively expensive leading to introducing dispersive liquid-liquid microextraction technique (DLLME) by Rezaee et al [17][18][19] Because of the advantages of DLLME such as rapidity of operation, simplicity, low cost, high enrichment factor and low environmental impact, 20 this technique has attracted the attention of researchers and has been growing more popular in recent years. 19,21 Combining DLLME with liquid phase microextraction based on solidification of floating organic droplet (DLLME-SFO), by Leong et al 22 resulted in developing a new microextraction technique termed as DLLME-SFO.…”

Section: Introductionmentioning

confidence: 99%

A Novel Dispersive Liquid-Liquid Microextraction Method Based on Solidification of Floating Organic Drop for Preconcentration of Pd(II) by Graphite Furnace Atomic Absorption Spectrometry after Complexation by a Thienyl Substituted 1,2-Ethanediamine

et al. 2015

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A novel dispersive liquid-liquid microextraction method based on solidification of floating organic drop (DLLME-SFO) was developed for the preconcentration of ultratrace amounts of palladium (Pd)(II) before its determination by electrothermal atomic absorption spectrometry. Diphenyl ether (m.p. 26 C) was used for the first time as a heavier than water organic solvent in the developed method. Pd was complexed by N,N′-bis(thiophen-2-ylmethylene)ethane-1,2-diamine to be extracted into the dispersed diphenyl ether phase using acetonitril as the disperser solvent. Upon cooling and centrifugation, the organic solvent was sedimented at the bottomn and the aqueous phase was easily decantated. Some factors influencing the extraction efficiency of Pd(II) and its subsequent determination, including extraction and dispersive solvent type and volume, pH of sample solution, concentration of the chelating agent and salting out effect, were studied and optimized both with univariate and multivariate methods. Under the optimized conditions, the calibration graph exhibited linearity over a range of 10 -120 μg L -1 . The enrichment factor was 83.3, the detection limit for Pd (3σ) was 47 ng L -1 and the relative standard deviation was 3.2% (n = 10, 1 ng mL -1 ). The method was successfully applied to the determination of trace amounts of Pd(II) in water samples.

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Recent advances in coupling single-drop and dispersive liquid–liquid microextraction with UV–vis spectrophotometry and related detection techniques

Cited by 85 publications

References 55 publications

Rapid and Highly Sensitive Determination of Melamine in Different Food Samples by Corona Discharge Ion Mobility Spectrometry after Dispersive Liquid-Liquid Microextraction

Rapid and Highly Sensitive Determination of Melamine in Different Food Samples by Corona Discharge Ion Mobility Spectrometry after Dispersive Liquid-Liquid Microextraction

Determination of Zinc, Copper, and Mercury in Water Samples by Using Novel Micro Cloud Point Extraction and UV-Vis Spectrophotometry

A Novel Dispersive Liquid-Liquid Microextraction Method Based on Solidification of Floating Organic Drop for Preconcentration of Pd(II) by Graphite Furnace Atomic Absorption Spectrometry after Complexation by a Thienyl Substituted 1,2-Ethanediamine

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