Zobrazeno 1 - 10
of 52
pro vyhledávání: '"John J. Langenfeld"'
Publikováno v:
Journal of Chromatography A. 740:139-145
Desorption profiles of analytes using a conventional split/splitless injection port after solid-phase microextraction were determined in real-time by direct coupling of the injection port to a mass spectrometer. Desorption times for aromatic hydrocar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e72504fc5bab10aabe91b41c74ada805
https://doi.org/10.1016/0021-9673(96)00140-9
https://doi.org/10.1016/0021-9673(96)00140-9
Publikováno v:
Analytical Chemistry. 67:1727-1736
Supercritical fluid extraction (SFE) rates of spiked polychlorinated dibenzo-p-dioxins (PCDDs) from Florisil, spiked [ 13 C]PCDDs and native PCDDs from fly ash, and spiked [ 2 H]polycyclic aromatic hydrocarbons (PAHs) and native PAHs from marine sedi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5534cd8410d3adb2dbc923903bd318d6
https://doi.org/10.1021/ac00106a013
https://doi.org/10.1021/ac00106a013
Publikováno v:
Analytical Chemistry. 66:909-916
Supercritical fluid extraction (SFE) using eight different CO[sub 2] + organic modifier mixtures and one ternary mixture (CO[sub 2] + methanol/toluene) at two different concentrations (1 and 10% v/v) was performed on two certified reference materials
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::698087c8b6cca516c47b67117ebc26a5
https://doi.org/10.1021/ac00078a024
https://doi.org/10.1021/ac00078a024
Publikováno v:
Analytical chemistry. 68(1)
Solid-phase microextraction (SPME) parameters were examined on water contaminated with hydrocarbons including benzene and alkylbenzenes, n-alkanes, and polycyclic aromatic hydrocarbons (PAHs). Absorption equilibration times ranged from several minute
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a3f8fa13be473b9a3136c140257a3c77
https://pubmed.ncbi.nlm.nih.gov/21619230
https://pubmed.ncbi.nlm.nih.gov/21619230
Autor:
Peter K.K. Louie, Mark D. Burford, Steven B. Hawthorne, David J. Miller, John J. Langenfeld, Sally E. Eckert-Tilotta
Publikováno v:
Journal of Chromatography A. 642:301-317
The development of quantitative supercritical fluid extraction (SFE) methods for the recovery of organic pollutants from environmental samples requires three steps: quantitative partitioning of the analytes from the sample into the extraction fluid,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7b945fb70f1369e403553ef7502fcc7c
https://doi.org/10.1016/0021-9673(93)80095-p
https://doi.org/10.1016/0021-9673(93)80095-p
Publikováno v:
Analytical Chemistry. 65:338-344
Three certified reference materials, polychlorinated biphenyls (PCBs) from river sediment, polycyclic aromatic hydrocarbons (PAHs) from urban air particulate matter, and PAHs from highly contaminated soil, were extracted with pure CO[sub 2] at conven
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::30c171773df61da1e4f35cb25bae5bad
https://doi.org/10.1021/ac00052a006
https://doi.org/10.1021/ac00052a006
Publikováno v:
Environmental Science & Technology. 26:2251-2262
Organic pollutants from winter urban air were collected using a conventional PM-10 high-volume air sampler (68 m 3 /h) which had been modified to include polyyrethane foam (PUF) sorbent sheets behind the quartz fiber filter. Fifty-five major semivola
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2a09513f82ed23ceb161bceefba5c3c9
https://doi.org/10.1021/es00035a026
https://doi.org/10.1021/es00035a026
Publikováno v:
Analytical Chemistry. 64:2263-2266
Densities of three pure supercritical fluids (Co 2 , N 2 O, and CHCIF 2 ) and one modified fluid (Co 2 modified with 5 volume % methanol) were determined over a wide range of pressures (60-600 atm) and temperatures (40-150 o C) using a simple device
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::23c0a6bbadfc4ccb3b61a3e2a98b3029
https://doi.org/10.1021/ac00043a014
https://doi.org/10.1021/ac00043a014
Publikováno v:
Analytical Chemistry. 64:1614-1622
Supercritical fluid extraction (SFE) recoveries for native pollutants including PCBs from a standard reference material sediment (SRM 1939), PAHs from a petroleum waste sludge, and PAHs from railroad bed soil were compared using supercritical CHCIF 2
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1911fc81b7810142b27f9753b87d282e
https://doi.org/10.1021/ac00038a020
https://doi.org/10.1021/ac00038a020
Publikováno v:
Journal of Chromatography A. 594:297-307
Supercritical fluid extraction (SFE) collection efficiences of 66 compounds with a wide range of volatility and polarity were examined. Good collection efficiencies required efficient partitioning of the analyte into the collection solvent after depr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::10b22117e5a7468ccd0508dca31dca61
https://doi.org/10.1016/0021-9673(92)80343-s
https://doi.org/10.1016/0021-9673(92)80343-s