Sample preparation for the analysis of volatile organic compounds in air and water matrices

Demeestere, Kristof; Dewulf, Jo; Witte, Bruno De; Langenhove, Herman Van

doi:10.1016/j.chroma.2007.01.012

Cited by 315 publications

(148 citation statements)

References 197 publications

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“…Despite the fact that activated carbon has the best retention volumes, it's use cause difficulties in thermal desorption of VOCs with boiling points above 70 0 С [1]. For VOCs with 8 boiling points in the range from 30 to 200 0 С, which make up more than 90% of air pollutants, more attractive in terms of sorption pre-concentration are hydrophobic polymeric sorbents with high surface area.…”

Section: Gas Chromatographic Determination Of Vocs In the Air With Somentioning

confidence: 99%

“…Low molecular weight organic compounds, which are discussed in the article, are usually present in the air in their vaporized state. The main methods of concentrating vapors of volatile organic compounds (VOCs) are cryogenic concentration [1][2][3], solvent extraction, performed in the impinger [4] and denudors [5][6]; active [7][8] and passive [8][9] sorption of substances by sorbents contained in cartridges or tubes, as well as solid-phase microextraction (SPME) [10][11]. SPME and passive sampling are more suitable for prolonged atmospheric air control, rather than for monitoring the concentration of VOC in real time, because of their inherent slow mass transfer.…”

Section: Introductionmentioning

confidence: 99%

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Modification of hydrophobic sorbents by cobalt chloride in order to concentrate low molecular polar organic substances from the air for subsequent gas chromatographic determination

Родинков

Zhuravleva

Bugaichenko

et al. 2015

Talanta

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The article presents a new method of modification of hydrophobic sorbents. To improve sorption pre-concentration of polar organic compounds in the air analysis, these sorbents are coated with cobalt chloride. This modification increases retention volume of lower alcohols by 5-10 fold as compared to that of unmodified sorbents and solves the problem of gaschromatographic determination at 1-2 ppb (micrograms / m3) by using the most common flame ionization detector. It should be noted that the modification of hydrophobic sorbents by cobalt chloride has little influence on their porosimetry parameters (specific surface area, proportions of meso-and micropores) and modified sorbents are capable of retaining hydrophobic nonpolar and weakly polar analytes as well as original unmodified sorbents. Thus, a fairly simple procedure leads to a large positive effect.

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Section: Gas Chromatographic Determination Of Vocs In the Air With Somentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modification of hydrophobic sorbents by cobalt chloride in order to concentrate low molecular polar organic substances from the air for subsequent gas chromatographic determination

Родинков

Zhuravleva

Bugaichenko

et al. 2015

Talanta

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show abstract

“…To gain a better knowledge of the GC detection properties of VOCs, application of the preconcentration technique is useful to compensate for the limited instrumental sensitivity of GC [11]. For the simple collection of VOCs, many types of carbon adsorbents can be employed such as active carbon, graphitized carbon, carbon molecular sieves (CMS), and synthetic polymeric adsorbents [14].…”

Section: Selection Of Sorbents For Ctmentioning

confidence: 99%

“…In fact, trapping efficiency of adsorbent traps tends to increase exponentially with decrease in temperature [2]. At present, cryogenic preconcentration of ambient VOCs is in practice with the aid of cryogenic fluids by which trapping can be accomplished in the temperature range of -150 -1708C [11]. However, as the coadsorption of atmospheric water vapor is inevitable at such subambient temperatures, it can also cause sampling and chromatographic interference [2].…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, use of Peltier cooling (PC) devices (e. g., an electrically cooled focusing trap) has been introduced as a highly convenient technique for cryogenic preconcentration [11]. Considering that the PC became a common choice for preconcentration, we evaluated the relative trapping efficiency of adsorbent combinations with the aid of Peltier systems.…”

Section: Introductionmentioning

confidence: 99%

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The effect of cold trap adsorbents on the gas chromatographic analysis of ambient VOCs under Peltier cooling conditions

Pal

Kim²

2008

J of Separation Science

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Original PaperThe effect of cold trap adsorbents on the gas chromatographic analysis of ambient VOCs under Peltier cooling conditionsIn this work, the relative analytical performance of the GC-based detection method was investigated with a major focus on cold trap (CT) adsorbent materials against four aromatic volatile organic compounds (VOCs) (e. g., benzene, toluene, xylene, and styrene). A series of calibration experiments were hence conducted under cryofocusing conditions formed by the Peltier cooling system in a thermal desorber (TD) unit. During the course of this study, comparative calibration datasets were acquired for each of the three CT types: (i) CT (I) = Carbopack B + Carbopack C, (ii) CT (II) = Carbopack B + Carboxen 1000, and (iii) CT (III) = Tenax TA. All calibration datasets were obtained under subambient temperature ( -108C) conditions controlled by the Peltier cooling system. The reliability of the calibration data was also assessed in an ancillary experiment with the aid of the modified injection through a thermal desorber (MITD) method. The results demonstrated that the GC detection properties of different VOCs were not altered significantly between different CT applications under Peltier conditions, although relative sensitivity could be distinguished moderately depending on the CT type.

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Membrane Techniques in Analytical Applications: Developments and Recent Advances

Pabby¹,

Sastre²

2009

Encyclopedia of Analytical Chemistry

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The article first presents an overview of the various membrane‐based systems and their role in analytical applications. This is followed by a systematic review of the various membrane extraction methods used to determine various compounds in different matrices in chemical, environmental, and biological applications. The reviewed methods include supported liquid membrane (SLM) extraction, microporous membrane liquid‐liquid extraction (MMLLE), polymeric membrane extraction (PME), semipermeable membrane devices (SPMDs), membrane‐assisted sorbent extraction (MASE), membrane extraction with a sorbent interface (MESI), and membrane inlet mass spectrometry (MIMS). Theory and principles, the possibility of combining membrane extraction methods with methods of final determination, and applications are discussed in detail. Emphasis is placed on the attractiveness of membrane‐based extraction techniques in terms of the challenging parameters and design aspects that must be considered when coupling membrane‐based extraction systems to on‐line or off‐line analytical systems. A section is devoted to familiarize analytical chemists who work with liquid samples with the practical aspects of the reviewed membrane extraction techniques. Finally, the advantages and disadvantages of the various techniques are discussed.

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Sample preparation for the analysis of volatile organic compounds in air and water matrices

Cited by 315 publications

References 197 publications

Modification of hydrophobic sorbents by cobalt chloride in order to concentrate low molecular polar organic substances from the air for subsequent gas chromatographic determination

Modification of hydrophobic sorbents by cobalt chloride in order to concentrate low molecular polar organic substances from the air for subsequent gas chromatographic determination

The effect of cold trap adsorbents on the gas chromatographic analysis of ambient VOCs under Peltier cooling conditions

Membrane Techniques in Analytical Applications: Developments and Recent Advances

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