Ionic Liquids as Advantageous Solvents for Headspace Gas Chromatography of Compounds with Low Vapor Pressure

André, M.; Loidl, J; Laus, Gerhard; Schottenberger, Herwig; Bentivoglio, Gino; Wurst, Klaus; Kh, Ongania

doi:10.1021/ac048737k

Cited by 63 publications

(46 citation statements)

References 31 publications

(47 reference statements)

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“…In addition, a reversal of enantiomeric elution order occurred when diastereomeric versions of the ILs were used. In another unique application, RTILs were examined as solvents for headspace GC (27). The compounds 2-ethyl-hexanoic acid, formamide, and tri-n-butylamine are examples of acidic, neutral, and basic analytes, respectively, that were dissolved in 1-n-butyl-3-methylimidazolium hydrogen sulfate and 1-n-butyl-2,3-dimethylimidazolium dicyanamide.…”

Section: Gcmentioning

confidence: 99%

Ionic Liquids in Analytical Chemistry

Anderson¹,

Armstrong²,

Wei³

2006

Anal. Chem.

491

326

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oom-temperature ionic liquids (RTILs), also known as liquid organic, molten, or fused salts, are a class of nonmolecular ionic solvents with low melting points. The accepted definition of an RTIL is any salt that has a melting point lower than ambient temperature (1). However, "ionic liquid" (IL) is often applied to any compound that has a melting point <100°C. Most common RTILs are composed of unsymmetrically substituted nitrogen-containing cations (e.g., imidazole, pyrrolidine, pyridine) with inorganic anions (e.g., Cl -, PF 6 -, BF 4 -). ILs are also interesting because of their other useful and intriguing physicochemical properties. Wilkes et al. first reported ambient-temperature ILs based on the 1-alkyl-3-methylimidazolium cation in 1982 (2). Since then, many ILs containing a variety of cations and anions of different sizes have been synthesized to provide specific characteristics.Over the past few years, research and applications of ILs have expanded tremendously. The initial impetuses for this expansion were organic synthesis and the growth of green chemistry. In this article, we will give an overview of the structure and properties of ILs and describe their expanding use in various applications in separations and chromatography, MS, spectroscopy, and electrochemistry. Description and propertiesILs have negligible vapor pressures at room temperature, possess a wide range of viscosities, can be custom-synthesized to be miscible or immiscible, often have high stability, and are capable of un-

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Section: Gcmentioning

confidence: 99%

Ionic Liquids in Analytical Chemistry

Anderson¹,

Armstrong²,

Wei³

2006

Anal. Chem.

491

326

View full text Add to dashboard Cite

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“…Acetonitrile, methanol, and acetone were commonly used in recent studies [25,27,34,36,37]. Due to the similar function of methanol and acetonitrile, we took the latter to represent the organic disperser and discuss the dispersive effect.…”

Section: Effect Of the Addition Of The Dispersive Solventmentioning

confidence: 99%

Determination of insecticides in water using in situ halide exchange reaction‐assisted ionic liquid dispersive liquid–liquid microextraction followed by high‐performance liquid chromatography

Li¹,

Gao²,

Zhang³

et al. 2011

J of Separation Science

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A dispersive liquid-liquid microextraction (DLLME) method using in situ halide exchange reaction to form ionic liquid (IL) extraction phase was developed to determine four insecticides (i.e. methoxyfenozide, tetrachlorvinphos, thiamethoxam, and diafenthiuron) in water samples. The preconcentration procedure, followed by high-performance liquid chromatography and variable wavelength detectors (VWD), enabled the formation of the immiscible IL extraction phase; the insecticides were transferred into the IL phase simultaneously, which enhanced the efficiency and sufficiency, greatly shortening the operation time. The experimental parameters affecting the extraction efficiency including volume of extraction IL, extraction and centrifugation times, volume of the sample solution and exchanging reagent, and addition of organic solvent and salt were investigated and optimized. Under optimized conditions, the extractions yielded recoveries of the target analytes from 82 to 102%. The calibration curves were linear, and the correlation coefficient ranged from 0.9990 to 0.9999 under the concentration levels of 5-200 μg/L. The relative standard deviation (n=6) was 2.9-4.6%. The limits of detection (LODs) for the four insecticides were between 0.98 and 2.54 μg/L.

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“…Besides extraction, ILs were demonstrated to be advantageous solvents for headspace GC analysis of compounds with low vapor pressures, owing to the nonvolatility and heat stability of ILs [101]. Three acidic, neutral, and basic model analytes with boiling points above 200°C dissolved in ILs were determined with limits of detection and limits of quantification at the low-ppm level.…”

Section: For Headspace Gas Chromatographymentioning

confidence: 99%

Ionic liquids in sample preparation

et al. 2008

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Due to their unique properties, their good extractabilities for various target analytes, and the fact that many compounds are highly soluble in them, room-temperature ionic liquids (ILs) are used as promising alternatives to the traditional organic solvents employed in sample preparation. ILs have been used as extraction solvents for a wide range of analytes, from environmental contaminates to biomacromolecules and nanomaterials, and as dissolution solvents for various detection techniques. In this paper, the main applications of ILs in sample preparation are reviewed, and the problems and challenges in this area are described.

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Ionic Liquids as Advantageous Solvents for Headspace Gas Chromatography of Compounds with Low Vapor Pressure

Cited by 63 publications

References 31 publications

Ionic Liquids in Analytical Chemistry

Ionic Liquids in Analytical Chemistry

Determination of insecticides in water using in situ halide exchange reaction‐assisted ionic liquid dispersive liquid–liquid microextraction followed by high‐performance liquid chromatography

Ionic liquids in sample preparation

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