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结果 1-10 的 14
Using elevated temperatures to enhance in-situ remediation in low-permeable soils and groundwater
1997
Heron, G.
In situ air sparging: lessons learned from applications and research in the United States
1997
Johnson, P.C. (Arizona State Univ. (USA))
[Bioslurping: a method for simultaneous elimination of the free phase and bioventilation [site remediation technology]]
1997
Illeris, J.
[Air sparging: soil conditions, control and finishing]
1997
Bull, N.
[Air sparging from horizontal drilling and vacuum extraction for elimination of chlorinated solvents]
1997
Henriksen, L.H. | Heron, T. | Dahlstroem, K.
A comprehensive evaluation on the use of oxygen release compound in bioremediation [ORC]
1998
Koenigsberg, S.S.
[Organic micropollutants in groundwater sources: Purification and use of water [AOX, CHC, BTX]]
1993
Arvin, E.
[Removal of pesticides and solvents: intensified purification in waterworks [Breum]]
1996
Nielsen, B.
[Technology development project in-well stripping of chlorinated solvents [AIWA, Adept in-Well Aerator]]
1999
Lauridsen, A.E. | Nyegaard, T.
Abatement of Polar Organics in Natural Wetlands and Rivers. Analitycal Methods
2001
Headley, J. (National Water Research Centre, Cairo (Egypt)) | Tawfic, T. A.
Here are described three innovative and complementary methods for the characterization of polar organics in natural waters. A simple and rugged GC/MS procedure is shown to be well suited for the determination of sulfolane, (tetrahydrothiophene 1,1-dioxide, C4H8O2S; a water miscible chemical used in the sweetening of sour-gas) a compound that is known to be readily sequested by wetland vegetation. In contrast, LC/MS employing electrospray ionization is ideal for the quantification of two other classes of polar chemicals, namely (a) alkanolamines in vegetation and (b) mixtures of naphthenic acids in natural waters in oilsands regions of Northern Alberta, Canada. The modem techniques take advantage of quite simple extraction procedures, with no need for derivatization steps and exploit the polar nature of the chemicals to separate the analytes from high back ground non-polar components. For the alkanolamines, MS/MS is a prerequisite for obtaining diagnostic product ion scans of the molecular ion formed under soft-ionization conditions.
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