Determining volatile organics in water

Mieure, James P.

doi:10.1021/es60168a002

Cited by 18 publications

(6 citation statements)

References 8 publications

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“…Activated charcoal was not evaluated due to its reported irreversible binding to various organic compounds (Mieure, 1980 Calibration was achieved by exposing all eight devices for times between four and twenty-four hours and concentrations from 0.01 to 0.3 mg/L (Table 3) Initial calibration of each device can be used to account for any device to device variation by use of their individual permeation constants (K). mg/L and times ranged from 4 to 24 hours.…”

Section: Resultsmentioning

confidence: 99%

Permeation sampling of halogenated ether priority pollutants

Frantz

Hardy

1998

Journal of Environmental Science and Health, Part A

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A method for the determination of five halogenated ether priority pollutants using time-weighted-average concentrations is described. These compounds permeate through a silicone polycarbonate membrane and are trapped onto a Tenax TA™ adsorbent. Compounds of interest are solvent desorbed by acetone, followed by separation and quantitation by gas chromatography-mass spectrometry (GC-MS). A linear relationship was found between the amount of halogenated ether trapped onto the Tenax adsorbent and the product of the concentration of ether in solution and the exposure time. Concentrations ranged from 0.04 to 7.2 mg/L for a twenty-four hour exposure. The temperature of solution was found to alter the pollutant permeation rate. This sampler offers the advantages of providing time-weighted-average concentrations with a relatively simple sampling method. 1275

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Section: Resultsmentioning

confidence: 99%

Permeation sampling of halogenated ether priority pollutants

Frantz

Hardy

1998

Journal of Environmental Science and Health, Part A

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“…Many analytical techniques for determining volatile halocarbons, including chloroform, in water samples have been reported (Mieure, 1980;Wolska et al, 1998;Nikolaou et al, 2002). Of those techniques, static headspace sampling by using solid-phase microextraction (SPME) is a convenient, cheaper but reliable way to isolate and concentrate many volatile halocarbons for gas-chromatographic analysis (Cai et al, 1993;Alpendurada et al, 2000).…”

Section: Discussionmentioning

confidence: 99%

Geochemical Transformation of Trichloroacetic Acid to Chloroform in Fresh Waters – The Results Based Upon Laboratory Experiments

Xiang

Jing

Zhang

et al. 2005

Water Air Soil Pollut

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In order to explore the geochemical transformation of trichloroacetic acid to chloroform in fresh waters, an experimental study by using laboratory microcosms was performed. The study confirmed the abiotic transformation of TCA to chloroform with various rate constants, ranging from approx. 3.29×10 −4 day −1 to 4.41×10 −4 day −1 , in different fresh waters at 25±1 • C. Also, an induction period (5-6 days) was observed before apparent degradation of TCA. Of the four geochemical factors including pH, oxygen, humic substances and ferric ion, the influence of lake HA, extracted from East Lake, on the transformation has been proven to be more substantial. Several model substances of HA, such as acetic acid, citric acid and β-Resorcylic acid etc., were also found to promote chloroform formation. Whilst, the results of pH effect experiments showed that higher yields of chloroform released from TCA solution occurred in the intensified alkaline media (pH = 10), an unusual condition in environment, indicating the limited effect of pH on the transformation under prevailing conditions in natural waters. According to our study, a mathematic model was built and successfully used to simulate TCA transformation to chloroform in fresh waters. Mathematic simulation demonstrates that the rates of decay for chloroform formation, after induction time, are mainly owing to rapid TCA degradation. In addition, biotic experiments indicated that fresh water algae affect TCA transformation to chloroform in varying degrees. The blue alga Anabaena cylindrica remarkably promoted chloroform formation, in weak acid media (pH = 6.5). While, the green alga Chlorella vulgari seems to indistinctively affect chloroform formation, whether in alkaline or weak acidic media. Enzyme or other byproducts of alga, such as citric acid, might play roles in the TCA transformation.

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“…For several decades, gas chromatography (GC) has been one of the most popular techniques for the detection, identification and separation of volatile and semi-volatile analytes, in complex, including biomass-related samples [29,30]. GC usually concentrates on the volatile organic species with lower polarity and lower boiling point (<350°C) [31].…”

Section: Gas and Liquid Chromatographymentioning

confidence: 99%

Separation procedures in the identification of the hydrogenation products of biomass-derived hydroxymethylfurfural

Soszka

Ruppert

2020

Reviews in Analytical Chemistry

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Lignocellulosic biomass is considered an attractive and most abundant renewable carbon feedstock. Hydroxymethylfurfural (HMF) is one of the platform molecules obtained from biomass. HMF transformation in the reductive atmosphere allows to obtain numerous value-added molecules with applications in several recently emerged sectors, e.g. biofuels and biopolymers. This process is still intensively investigated, and more efficient, stable and sustainable solutions are envisaged. Therefore, the choice of efficient analytical methods is of great importance. This review covers the methodologies used for the analysis of HMF hydrodeoxygenation, including chromatographic and spectrometric methods. Techniques such as gas chromatography, high-performance liquid chromatography, Fourier transform infrared spectroscopy, nuclear magnetic resonance, and mass spectrometry are mentioned as well in this review.

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Determining volatile organics in water

Cited by 18 publications

References 8 publications

Permeation sampling of halogenated ether priority pollutants

Permeation sampling of halogenated ether priority pollutants

Geochemical Transformation of Trichloroacetic Acid to Chloroform in Fresh Waters – The Results Based Upon Laboratory Experiments

Separation procedures in the identification of the hydrogenation products of biomass-derived hydroxymethylfurfural

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