Zobrazeno 1 - 10
of 295
pro vyhledávání: '"K. LEVSEN"'
Publikováno v:
Magnetic Resonance in Chemistry. 41:949-954
We report two new asterosaponins from the Baltic starfish Asterias rubens along with their 1H and 13C NMR data. The compounds were isolated after on-flow liquid chromatography–NMR–mass spectrometry screening indicated that they had not been ident
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::87877f6fcda8ca30d1223994a7f8df93
https://doi.org/10.1002/mrc.1277
https://doi.org/10.1002/mrc.1277
Autor:
K Levsen
Publikováno v:
TrAC Trends in Analytical Chemistry. 19:27-48
HPLC– 1 H NMR in combination with HPLC–MS is particularly suited to the identification of unknown polar, non-volatile compounds in complex environmental samples, i.e. to non-target analysis of such samples, if pollutants are present in the ppb ra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5da87abfb1ac7efcb9ea50ace37c8c70
https://doi.org/10.1016/s0165-9936(99)00178-8
https://doi.org/10.1016/s0165-9936(99)00178-8
Publikováno v:
Analytical Chemistry. 71:4513-4518
An automated system for quasi-continuous and on-site monitoring of organic compounds in water is presented. It is based on solid-phase microextraction (SPME) coupled to gas chromatography (GC) using a stopped-flow approach. The analytes are extracted
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::19231552adc13813d6476f6f7ba67001
https://doi.org/10.1021/ac9903656
https://doi.org/10.1021/ac9903656
Publikováno v:
Chemosphere. 35:3013-3024
40 rainwater samples were collected in Hannover and near Peine (Lower Saxony, Germany) in 1992 using a wet-only collector. The samples were extracted by solid phase extraction and analyzed by GC/MS for 59 pesticides. 11 pesticides were found in more
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::555721afaa34ba94b4b48121b64a3b43
https://doi.org/10.1016/s0045-6535(97)10003-0
https://doi.org/10.1016/s0045-6535(97)10003-0
Autor:
Paolo Laj, M. Preiss, Mark A. Sutton, Wolfram Wobrock, Keith Bower, Martin Gallagher, K. Levsen, Maria Cristina Facchini, John N. Cape, G. Helas, C. Kruisz, J. A. Lind, Bengt G. Martinsson, Birgitta Svenningsson, Roy N. Colvile, John D. Peak, R.L. Storeton-West, B. G. Arends, Axel Berner, Göran Frank, D. Schell, J. J. Mols, P. Wieser, Erik Swietlicki, P. Winkler, K. M. Beswick, M. M. David, T. Engelhardt, R. Maser, Thomas Choularton, K. J. Noone, Manfred Wendisch, M. Wells, B. Mentes, E. Seyffer, Detlev Möller, David Fowler, M. Bizjak, G. P. A. Kos, W. Wieprecht, H. W. Georgii, K. Acker, S. Pahl, K. J. Hargreaves, D. L. Sedlak, Hans-Christen Hansson, Roy M. Harrison, S. I. Cederfelt, Alfred Wiedensohler, G. Orsi, D. Orsini, W. Jaeschke, B. Jones, A. Hallberg, Sandro Fuzzi, R. Gieray, GJ Dollard, T. Davies, Jens Lüttke
Publikováno v:
Atmospheric Environment. 31:2393-2405
The 1993 Ground-based Cloud Experiment on Great Dun Fell used a wide range of measurements of trace gases, aerosol particles and cloud droplets at five sites to study their sources and sinks especially those in cloud. These measurements have been int
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a67b846c6c9763caf045bb721980bcee
https://doi.org/10.1016/s1352-2310(96)00316-0
https://doi.org/10.1016/s1352-2310(96)00316-0
Publikováno v:
Analytical and Bioanalytical Chemistry. 356:445-451
High-field proton nuclear magnetic resonance ((1)H-NMR) spectroscopy was applied to the analysis of nitroaromatics and nitramines in ammunition waste water. The (1)H-chemical shifts data of a variety of reference compounds are presented. Three ground
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7be04d487c934311fc9467bf886ae906
https://doi.org/10.1007/s0021663560445
https://doi.org/10.1007/s0021663560445
Publikováno v:
Acta Hydrochimica et Hydrobiologica. 24:226-231
Explosives belonging to the group of nitrotoluenes may be readily extracted with C18 adsorbent in the off-line mode and also in on-line coupling of the extraction unit to HPLC, while polar explosives like hexyl, HMX, and RDX show a substantial breakt
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fb7ff2c0d1ad1f470df7c00c51c2de51
https://doi.org/10.1002/aheh.19960240506
https://doi.org/10.1002/aheh.19960240506
Publikováno v:
Fresenius' Journal of Analytical Chemistry. 348:654-659
27 phenols including mono- di-, tri-, tetra- and pentachlorophenols, mono- and dinitrophenols, mono- and dinitrocresols and dimethylnitrophenols have been extracted from aqueous samples by solid phase extraction using both modified silica gel (C18) a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a139af735ac54e73cee23ff78693f7be
https://doi.org/10.1007/bf00325568
https://doi.org/10.1007/bf00325568
Publikováno v:
Chromatographia. 37:361-364
An indirect GC method is described for the determination of Ethephon in drinking water on the basis of the headspace analysis of the ethylene formed from Ethephon. In order to reach the necessary detection limit, the entire volume of the static heads
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c090681cd84f8e7f34693671600dc99e
https://doi.org/10.1007/bf02272249
https://doi.org/10.1007/bf02272249
Publikováno v:
Atmospheric Environment. Part B. Urban Atmosphere. 27:183-192
The time dependence of the emission of organic compounds from a polyamide floor covering with styrene-butadiene-rubber (SBR) backing was studied in three climate chambers (0.03, 1.0 and 38 m3) at 23°C 5nd 45% RH. While volatile compounds such as tol
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2ddd7022ff4a3916861fc340375626b2
https://doi.org/10.1016/0957-1272(93)90004-p
https://doi.org/10.1016/0957-1272(93)90004-p