Trace analysis of volatile polar organics by direct aqueous injection gas chromatography

Middleditch, Brian S.; Sung, N. J.; Zlatkis, A.; Settembre, G.

doi:10.1007/bf02311779

Cited by 28 publications

(14 citation statements)

References 3 publications

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“…As noted by Grob, Potter, and others, large aqueous injections using splitless DAI gives slightly broadened peaks (28,29,(31)(32)(33)(34)(35) due to the expansion of water in the heated injector. Peak broadening due to this effect appears to be minimized in a recently reported adaptation of ASTM D4815 due to the use of a packed polar precolumn (36).…”

Section: Resultsmentioning

confidence: 73%

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

Church

Isabelle

Pankow

et al. 1997

Environ. Sci. Technol.

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An analytical method is described that can detect the major alkyl ether compounds that are used as gasoline oxygenates (methyl tert-butyl ether, MTBE; ethyl tert-butyl ether, ETBE; and tert-amyl methyl ether, TAME) and their most characteristic degradation products (tert-butyl alcohol, TBA; tert-butyl formate, TBF; and tert-amyl alcohol, TAA) in water at sub-ppb concentrations. The new method involves gas chromatography (GC) with direct aqueous injection (DAI) onto a polar column via a splitless injector, coupled with detection by mass spectrometry (MS). DAI-GC/MS gives excellent agreement with conventional purgeand-trap methods for MTBE over a wide range of environmentally relevant concentrations. The new method can also give simultaneous identification of polar compounds that might occur as degradation products of gasoline oxygenates, such as TBA, TBF, TAA, methyl acetate, and acetone. When the method was applied to effluent from a column microcosm prepared with core material from an urban site in New Jersey, conversion of MTBE to TBA was observed after a lag period of 35 days. However, to date, analyses of water samples from six field sites using the DAI-GC/MS method have not produced evidence for the expected products of in situ degradation of MTBE.

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Section: Resultsmentioning

confidence: 73%

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

Church

Isabelle

Pankow

et al. 1997

Environ. Sci. Technol.

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show abstract

“…This effect was already observed during the analysis of chlorinated compounds in water with ECD [32] or during the analysis of halogen-containing compounds in water with a TCD [34]. It can be interpreted as being due to the condensation of water in the columns (solvent flooding), which induces a spatial spreading of water in the capillary tube and gives rise to a signal having a plateau shape.…”

Section: Effect Of Presence Of Watermentioning

confidence: 87%

“…The test was repeated ten times consecutively to evaluate a possible trend with the repetitive injection of water. tionary phase after tens of injection of water [32]. However, the authors also reported a decline in column performance after hundreds of injections and an extended working period of the studied column.…”

Section: Effect Of Presence Of Watermentioning

confidence: 91%

“…Since few data dealing with the siloxane based stationary phases exist, it was therefore necessary to estimate the influence of water on the analysis, and more specifically on the detector response. Indeed, it was shown that the presence of water can disturb the baseline signal when analyses are performed with Photo Ionisation Detector (PID), Electron Capture Detector (ECD), or Far Ultra Violet Detector (FUVD) [32,33]. It could thus provide additional difficulties for the data interpretation, and, more particularly, for quantitative analysis.…”

Section: Effect Of Presence Of Watermentioning

confidence: 98%

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Dual column capillary gas chromatographic system for the in situ analysis of volatile organic compounds on a cometary nucleus

Szopa¹,

Pra

Tellini

et al. 2004

J of Separation Science

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Two Wall Coated Open Tubular capillary columns, coated with poly(cyanopropylphenyl-dimethyl)siloxane and poly(diphenyl-dimethyl)siloxane stationary phases, have been selected for use in the COmetary SAmpling and Composition space experiment for the separation and identification of the wide range of volatile organic compounds which could be present in cometary nuclei. This article presents the main characteristics of the tandem column system for the analysis of solutes of cometary interest within the constraints of space instrumental operating conditions. The high efficiency of the columns is demonstrated and the influence of the operating conditions on their separation properties are investigated. The studied columns exhibit complementary retention pattern: their use in a dual column system makes it possible to achieve the separation and the identification of the compounds of interest. Finally, the good analytical behavior of the columns when analyzing samples which include large amounts of water, the main presumed volatile in comets, is demonstrated. The presented results thus show the suitability of the selected tandem columns system for the desired analyses, and their performance on adaptation to in-situ cometary chemical investigation.

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“…Middleditch et al [52] also applied direct aqueous injection for the analysis of polar volatile organics in water. The use of several detectors was evaluated.…”

Section: On-column Injectionmentioning

confidence: 99%

Trace level analysis of micropollutants in aqueous samples using gas chromatography with on-line sample enrichment and large volume injection

Mol

Janssen

Cramers

et al. 1995

Journal of Chromatography A

106

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Trace analysis of volatile polar organics by direct aqueous injection gas chromatography

Cited by 28 publications

References 3 publications

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

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

Dual column capillary gas chromatographic system for the in situ analysis of volatile organic compounds on a cometary nucleus

Trace level analysis of micropollutants in aqueous samples using gas chromatography with on-line sample enrichment and large volume injection

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