Hydrocarbons in Eastern Canadian Marine Waters Determined by Fluorescence Spectroscopy and Gas–Liquid Chromatography

1977 ◽  
Vol 34 (3) ◽  
pp. 347-353 ◽  
Author(s):  
P. D. Keizer ◽  
D. C. Gordon Jr. ◽  
J. Dale
Keyword(s):  
Liquid Chromatography ◽  
Fluorescence Spectroscopy ◽  
Key Words ◽  
Petroleum Products ◽  
Gas Liquid Chromatography ◽  
Marine Waters ◽  
Northwest Atlantic ◽  
Oil Hydrocarbons ◽  
Contour Plots

Concentrations of n-alkanes ranged from <20 ng/ℓ to about 1 μg/ℓ at depths of 2 and 50 m. Estimated oil concentrations based on fluorescence analyses ranged from 0.2 to 9.3 μg/ℓ. The highest concentrations occurred in Bedford Basin; the similarity of fluorescence contour plots to petroleum products and the presence of unresolved envelopes in chromatograms suggest that a large portion of the hydrocarbons in the Basin are derived from oil. Hydrocarbons in other regions appear to be principally biogenic in origin. Key words: Oil detection, northwest Atlantic, gas–liquid chromatography, fluorescence spectroscopy

Preliminary Assessment of the Presence of Oil in the Ecosystem at Ekofisk After the Blowout, April 22–30, 1977

1978 ◽  
Vol 35 (5) ◽  
pp. 544-551 ◽  
Author(s):  
P. R. Mackie ◽  
R. Hardy ◽  
K. J. Whittle
Keyword(s):  
Liquid Chromatography ◽  
Crude Oil ◽  
Key Words ◽  
Water Column ◽  
Water Samples ◽  
Surface Film ◽  
Gas Liquid Chromatography ◽  
Preliminary Assessment ◽  
Oil Components ◽  
High Fluorescence

The marine environment in the Ekofisk area was assayed for the presence of oil components after the blowout on Platform Bravo was brought under control. Several methods of assay were used but the results were not always strictly comparable. Relatively high fluorescence values were observed in water samples in the vicinity of the platform. However, gas–liquid chromatography of these samples indicated that although some of the hydrocarbon fractions now resembled crude oil, none had increased markedly in concentration. The presence of oil could be detected in the biota and taste panels were able to identify an oily taint at low level in some fish caught near the platform. A second survey some 2 mo after the spill indicated that little, if any, oil from the blowout remained in the water column. Key words: Ekofisk, petroleum, surface film, water, sediment, fish

Assigning structures to diastereomeric aliphatic α,α'-dibromo ketones

2002 ◽  
Vol 80 (4) ◽  
pp. 413-417 ◽  
Author(s):  
Masood Parvez ◽  
SM Humayan Kabir ◽  
Ted S Sorensen ◽  
Fang Sun ◽  
Brian Watson
Keyword(s):  
Liquid Chromatography ◽  
Key Words ◽  
Crystal Structures ◽  
Chemical Shifts ◽  
Gas Liquid Chromatography ◽  
X Ray ◽  
Nmr Chemical Shifts ◽  
H Nmr ◽  
Dibromo Ketones

X-ray crystal structures are reported for two symmetrical aliphatic α,α'-dibromo ketones: a meso diastereomer of 3,5-dibromo–2,2,6,6-tetramethylheptan-4-one, and a rac isomer of 4,6-dibromo–2,2,3,3,7,7,8,8-octamethylnonan-5-one. Using these secure assignments and a previously confirmed structure for the diastereomers of 2,4-dibromopentan-3-one, we show in this study that gas-liquid chromatography (GLC) retention times (meso > rac) can be used to confidently assign the diastereomers for a range of symmetrical and unsymmetrical aliphatic α,α'-dibromo ketones. 1H NMR chemical shifts for the >CHBr hydrogen(s) can also be corroboratively used for assignment purposes (δracH > δmesoH).Key words: α,α'-dibromo ketones, X-ray crystal structures, GLC retention times, isomer assignment

A study of asphalt-aggregate interactions using inverse gas-liquid chromatography

1974 ◽  
Vol 24 (11) ◽  
pp. 645-654 ◽  
Author(s):  
F. Alan Barbour ◽  
Richard V. Barbour ◽  
J. Claine Peterson
Keyword(s):  
Liquid Chromatography ◽  
Gas Liquid Chromatography

GASCHROMATOGRAPHIC DETERMINATION OF STEROIDS IN THE URINE OF PATIENTS WITH CUSHING'S SYNDROME

1971 ◽  
Vol 67 (2) ◽  
pp. 303-315 ◽  
Author(s):  
A. J. Moolenaar ◽  
A. P. van Seters
Keyword(s):  
Liquid Chromatography ◽  
Cushing’S Syndrome ◽  
Normal Subjects ◽  
Diagnostic Value ◽  
Cushing's Syndrome ◽  
Gas Liquid Chromatography ◽  
Obese Subjects

ABSTRACT The 17-oxosteroids were estimated in the urine of 27 patients with Cushing's syndrome by gas-liquid chromatography (G. L. C.). The values of the various steroid fractions are compared with those of normal subjects, patients with thyrotoxicosis and obese subjects. The effect of the age of the patients on the diagnostic value of the invidual 17-oxosteroids and their ratios is discussed.

Simultaneous Determination of Lactulose and Mannitol in Urine of Burn Patients by Gas-Liquid Chromatography

1992 ◽  
Author(s):  
Ronald L. Shippee ◽  
Avery A. Johnson ◽  
William G. Cioffi ◽  
James Lasko ◽  
Thomas E. LeVoyer
Keyword(s):  
Liquid Chromatography ◽  
Simultaneous Determination ◽  
Gas Liquid Chromatography ◽  
Burn Patients
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