Method for Determination of Methyl<i>tert</i>-Butyl Ether and Its Degradation Products in Water

Church, Clinton D.; Isabelle, Lorne M.; Pankow, James F.; Rose, Donna L.; Tratnyek, Paul G.

doi:10.1021/es9705452

Cited by 75 publications

(59 citation statements)

References 27 publications

(39 reference statements)

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“…The injection of the aqueous portion of the drop had no apparent effect on the quality of the chromatogram and no major maintenance or column replacement had to be undertaken after over 350 injections. Several papers have been published on direct aqueous injection [11][12][13], which involves injection of aqueous solutions onto the column. These studies have found that column activation due to water is far more pronounced for condensed water than for water vapour.…”

Section: Discussionmentioning

confidence: 99%

Solvent microextraction of chlorinated pesticides

Jager

Andrews

1999

Chromatographia

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SummaryThis paper is a preliminary report on a fast method for the extraction of organochlorine pesticides from river water which is inexpensive, fast and has little to no waste that has been developed. Pesticide extraction was achieved using the relatively new technique of solvent microextraction. In this technique a 2 #L drop of organic solvent is suspended on the tip of a microsyringe in a stirred aqueous sample solution. After the prescribed extraction time the drop is drawn back into the syringe. The syringe is then removed and the contents are injected into a gas chromatograph for analysis. Extraction of eleven organochlorinated pesticides from aqueous solutions with concentrations down to 1 ng mL -1 was achieved. The developed procedure was tested as a screening method for pesticides with spiked river water samples and was found to be linear over the concentration range of interest.

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Section: Discussionmentioning

confidence: 99%

Solvent microextraction of chlorinated pesticides

Jager

Andrews

1999

Chromatographia

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“…More recent microcosm (3) and column (6) studies suggest that limited intrinsic biodegradation of MTBE may occur. One research group observed MTBE mineralization activity in stream-bed sediments from both contaminated and pristine sites under aerobic conditions (4,5).…”

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confidence: 99%

Aerobic Biodegradation of Methyl tert -Butyl Ether by Aquifer Bacteria from Leaking Underground Storage Tank Sites

Kane

Beller

Legler

et al. 2001

Appl Environ Microbiol

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The potential for aerobic methyl tert-butyl ether (MTBE) degradation was investigated with microcosms containing aquifer sediment and groundwater from four MTBE-contaminated sites characterized by oxygenlimited in situ conditions. MTBE depletion was observed for sediments from two sites (e.g., 4.5 mg/liter degraded in 15 days after a 4-day lag period), whereas no consumption of MTBE was observed for sediments from the other sites after 75 days. For sediments in which MTBE was consumed, 43 to 54% of added [U-14 C]MTBE was mineralized to 14 CO 2 . Molecular phylogenetic analyses of these sediments indicated the enrichment of species closely related to a known MTBE-degrading bacterium, strain PM1. At only one site, the presence of water-soluble gasoline components significantly inhibited MTBE degradation and led to a more pronounced accumulation of the metabolite tert-butyl alcohol. Overall, these results suggest that the effects of oxygen and water-soluble gasoline components on in situ MTBE degradation will vary from site to site and that phylogenetic analysis may be a promising predictor of MTBE biodegradation potential.The magnitude and remediation cost of methyl tert-butyl ether (MTBE) contamination in drinking water have rapidly become a national concern. It has been estimated that 250,000 of the approximately 385,000 confirmed leaking underground storage tank (LUST) releases in the United States involve MTBE (15). In California, at least 10,000 LUST sites are estimated to be contaminated with MTBE (13). Several states, including California, have set primary maximum concentration levels for MTBE at or below 20 g/liter, and at an even lower level of 12 g/liter for tert-butyl alcohol (TBA), an MTBE metabolite. The U.S. Environmental Protection Agency has listed MTBE as a possible human carcinogen, whereas TBA is a known animal carcinogen (7). MTBE appears to be more mobile and less biodegradable than BTEX compounds (benzene, toluene, ethylbenzene, and xylenes), and consequently, MTBE plumes have extended over kilometer-scale distances, as is the case at Port Hueneme, Calif., and East Patchogue, N.Y.Previous microcosm studies reported little or no biodegradation of MTBE under a variety of aerobic (11,14) and anaerobic (18,23,26) conditions. More recent microcosm (3) and column (6) studies suggest that limited intrinsic biodegradation of MTBE may occur. One research group observed MTBE mineralization activity in stream-bed sediments from both contaminated and pristine sites under aerobic conditions (4,5). Mixed cultures capable of MTBE degradation have been isolated from activated sludge (10,20). Pure bacterial cultures capable of MTBE metabolism have been reported (12,17,22), including strain PM1, which uses MTBE as a sole carbon source and electron donor (12), and propane-oxidizing strains that cometabolize MTBE (22). In microcosm and field experiments, Salanitro et al. (21) showed that oxygenation in combination with bioaugmentation with an MTBE-degrading consortium resulted in more rapid MTBE degradation, alt...

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“…GC/MS is a more reliable and sensitive technique. A variety of sample preparation or enrichment methods can be coupled to GC/MS such as direct aqueous injection (Church et al 1997;Hong et al 1999; Zwank et al 2002), headspace (Lin et al 2003), solid phase microextraction (Piazza et al 2001;Dewsbury et al 2003), and purge and trap (Rosell et al 2003). The selection of the analysis technique depends on the desired selectivity, sensitivity, and matrix to be analyzed.…”

Section: Methodsmentioning

confidence: 99%

Activated Carbon Adsorption of Fuel Oxygenates MTBE and ETBE from Water

İnal

Yetgin

Aksu

et al. 2009

Water Air Soil Pollut

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The aqueous phase adsorption of fuel oxygenates methyl tertiary butyl ether (MTBE) and ethyl tertiary butyl ether (ETBE) onto commercially available granular activated carbon (GAC; Norit GAC 1240) was investigated in a batch system at 27°C. The oxygenate concentrations were determined by headspace gas chromatography/mass spectrometry analyses. The experimental data were used with four two-parameter isotherm models (Langmuir, Freundlich, Temkin, and DubininRadushkevich) and two kinetic models (pseudo firstorder and pseudo second-order) to determine equilibrium and kinetic parameters. Considering the correlation coefficient and root mean square error, Dubinin-Radushkevich isotherm showed better fit with the equilibrium data for MTBE. However, the performances of Langmuir and Dubinin-Radushkevich models were comparable for ETBE. The adsorption capacities were calculated as 5.50 and 6.92 mg/g for MTBE and ETBE, respectively, at an equilibrium solution concentration of 1 mg/L using Dubinin-Radushkevich isotherm. The differences between the model predictions and experimental data were similar for the pseudo first-order and pseudo secondorder kinetic models. Gibbs free-energy changes of adsorption were found to be −22.59 and −28.55 kJ/mol for MTBE-GAC and ETBE-GAC systems, respectively, under the experimental conditions studied.

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Method for Determination of Methyltert-Butyl Ether and Its Degradation Products in Water

Cited by 75 publications

References 27 publications

Solvent microextraction of chlorinated pesticides

Solvent microextraction of chlorinated pesticides

Aerobic Biodegradation of Methyl tert -Butyl Ether by Aquifer Bacteria from Leaking Underground Storage Tank Sites

Activated Carbon Adsorption of Fuel Oxygenates MTBE and ETBE from Water

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