A Pure Rubidium/Quartz Source for Alkali Flame Ionization Detectors

1978 ◽  
Vol 16 (1) ◽  
pp. 8-11 ◽  
Author(s):  
R. Greenhalgh ◽  
J. Muller ◽  
W. A. Aue
Keyword(s):  
Flame Ionization ◽  
Ionization Detectors

SYMPOSIUM ON URINARY CONSTITUENTS OF LOW MOLECULAR WEIGHT Session III

1968 ◽  
Vol 14 (6) ◽  
pp. 491-512 ◽  
Author(s):  
Ian E Bush
Keyword(s):  
Biochemical Analysis ◽  
General System ◽  
Low Molecular Weight ◽  
Gas Liquid Chromatography ◽  
Double Blind ◽  
Flame Ionization ◽  
Routine Work ◽  
Central Apparatus ◽  
Ionization Detectors ◽  
Blind Trials

Abstract A summary of the strategy and progress in devising a general system of biochemical analysis based on the direct photometry, or "scanning" of thin-media chromatograms is presented. Recent results suggest that the method is as precise and as accurate as other types of quantitative chromatography. It is capable of reasonably easy adoption by workers previously unfamiliar with the basic technic and apparatus. It has been subjected to more rigorous quality control by blind and double-blind trials concurrent with ordinary routine work than is usual, and has passed these tests adequately. Data processing by a small, relatively inexpensive digital computer is capable of handling the data produced by the central apparatus of the method. The sensitivity of newer instruments using well-established fluorescence reactions compares very favorably with that of flame-ionization detectors in gas-liquid chromatography but not with the electron-capture detector as yet.

scholarly journals Seasonal and Circadian Rhythm of a 1,8-Cineole Chemotype Essential Oil of Calycolpus goetheanus From Marajó Island, Brazilian Amazon

2020 ◽  
Vol 15 (6) ◽  
pp. 1934578X2093305
Author(s):  
Edimara L. dos Santos ◽  
Ananda M. Lima ◽  
Vilmara Fabrícia dos S. Moura ◽  
William N. Setzer ◽  
Joyce Kelly R. da Silva ◽  
...  
Keyword(s):  
Circadian Rhythm ◽  
Chemical Composition ◽  
Rainy Season ◽  
Brazilian Amazon ◽  
Dry Season ◽  
Chemical Compositions ◽  
Flame Ionization ◽  
Group I ◽  
Marajó Island ◽  
Ionization Detectors

Chemical composition of essential oils (EOs) of Calycolpus genus have been reported in the literature. However, there is only 1 report about volatile profile from Calycolpus goetheanus. This work aims to evaluate the seasonal and circadian influences on EO composition and yield of C. goetheanus collected in Marajó Island, Brazilian Amazon. For the circadian study, the leaves were collected in January (rainy season) and July (dry season) every 3 hours during a period of 15 hours. The EOs were obtained by hydrodistillation and their chemical compositions analyzed by gas chromatography coupled to mass spectrometry and flame ionization detectors. The major compound identified in all EO samples was 1,8-cineole with amounts ranged from 14.4% (January, 6 am) to 33.0% (July, 3 pm). The highest average of 1,8-cineole was obtained during circadian study of the dry season (25.5% ± 5.8%) and the lowest during the circadian study of the rainy season (15.6% ± 1.5%). The multivariate analysis grouped the samples into 2 different groups: Group I characterized by the lowest amounts of 1,8-cineole (16.0%-18.7%), and Group II characterized by a higher content of 1,8-cineole (24.0%-33.0%). The oil yield and chemical composition did not show relationship with climate parameters (solar radiation, humidity, and temperature). Therefore, there was only quantitative variability in the EOs compositions during the circadian rhythm evaluated on dry and rainy seasons.

Experimental Study of Gas Dispersion over Complex Terrain

2016 ◽  
Vol 821 ◽  
pp. 85-90 ◽  
Author(s):  
Petr Michálek ◽  
David Zacho
Keyword(s):  
Experimental Study ◽  
Complex Terrain ◽  
Dispersion Model ◽  
Concentration Field ◽  
Ground Level ◽  
Gas Emission ◽  
Gas Dispersion ◽  
Terrain Model ◽  
Flame Ionization ◽  
Ionization Detectors

Experimental study of gas dispersion over complex terrain model was performed in VZLU Prague. A complex terrain model was mounted into a boundary layer wind tunnel and equipped with ground-level gas emission source. Concentration field of the emitted gas was measured using comb suction probe and flame ionization detectors. The results will serve for verification and validation of a new computational dispersion model.

Gas Chromatographic Detection of D-( - )-2,3-Butanediol and Butyric Acid Produced by Sporeformers in Cream-Style Corn and Canned Beef Noodle Soup: Collaborative Study

1985 ◽  
Vol 68 (4) ◽  
pp. 626-631
Author(s):  
Mary L Schafer ◽  
James T Peeler ◽  
Joe G Bradshaw ◽  
Cleo H Hamilton ◽  
Ruth B Carver
Keyword(s):  
Butyric Acid ◽  
Volatile Fatty Acids ◽  
Collaborative Study ◽  
Bacillus Species ◽  
Flame Ionization ◽  
Chromatographic Detection ◽  
Liquid Portion ◽  
Gas Chromatographic Method ◽  
Negative Controls ◽  
Ionization Detectors

Abstract A gas chromatographic method that identifies sporeformers as the cause of spoilage in swollen cans of low-acid foods was collaboratively studied in 2 stages. Two organic compounds produced by sporeformers, D-( — )-2,3-butanediol and butyric acid, are measured in the upper phase after centrifugation of the liquid portion of the can contents. Each sample is assayed on 2 packed columns designed for the assay of aqueous solutions of volatile fatty acids, using flame ionization detectors. For study 1,16 duplicate inoculated cans of cream-style corn and beef noodle soup were sent to 9 collaborators. For study 2, 7 collaborators received 11 duplicate inoculated cans of the 2 foods. Duplicate uninoculated cans of each food served as negative controls. The inocula were 6 sporeforming organisms (4 Clostridium and 2 gas-forming Bacillus species) and 2 nonsporeformers. After the deletion of marginal samples, the percentages of correctly identified sporeformers and nonsporeformers in beef noodle soup were 83 (110/132) and 90 (54/60), respectively; corresponding percentages for cream-style corn were 80 (98/123) and 100 (35/35). The method has been adopted official first action.

Flame ionization detectors

1963 ◽  
Vol 10 ◽  
pp. 294-302 ◽  
Author(s):  
J. Middlehurst ◽  
B. Kennett
Keyword(s):  
Flame Ionization ◽  
Ionization Detectors

Cold Engine Transient Fuel Control Experiments in a Port Fuel Injected CFR Engine

2007 ◽  
Author(s):  
Leonard J. Hamilton ◽  
Jim S. Cowart
Keyword(s):  
Steady State ◽  
Fuel Mixture ◽  
Operating Regime ◽  
Warm Up ◽  
Flame Ionization ◽  
Mixture Preparation ◽  
Steady State Operation ◽  
Fuel Vaporization ◽  
Unburned Hydrocarbons ◽  
Ionization Detectors

Air-fuel mixture preparation is particularly challenging during cold engine throttle transients due to poor fuel vaporization and transport delays in port fuel injected (PFI) engines. In this study, a PFI Cooperative Fuels Research engine is used to evaluate torque and measure in cylinder and exhaust CO, CO2 and unburned hydrocarbons during throttle transients at various early stages of engine warm-up. Fast flame ionization detectors and non-dispersive infra-red fast CO and CO2 detectors are used to provide detailed cycle-by-cycle analysis. Torque after cold throttle transients is found to be comparable to steady state torque due to allowable spark advance. However, cold transients produce up to 4 times the unburned hydrocarbons when compared to steady state operation. Finally, the x-tau fuel control model is evaluated in this challenging operating regime and is found to provide poor transient fuel control due to excessive fueling.

Occurrence and Distribution of 2-Butanol, 1-Butanol, 1-Pentanol, and 1-Hexanol in Distilled Alcoholic Beverages

1977 ◽  
Vol 60 (2) ◽  
pp. 297-301
Author(s):  
John H Barnett ◽  
Joanne R Einsmann
Keyword(s):  
Methyl Acetate ◽  
Alcoholic Beverage ◽  
Isoamyl Alcohol ◽  
Isoamyl Acetate ◽  
Alcoholic Beverages ◽  
Chromatographic System ◽  
Isobutyl Alcohol ◽  
Flame Ionization ◽  
Liquid Chromatographic ◽  
Ionization Detectors

Abstract A survey was made of the distribution of 2-butanol, 1-butanol, 1-pentanol, and 1-hexanol in 198 brands of distilled alcoholic beverages. The principal concern of this study was to determine the applicability of any of the 4 congeners studied to be used as parameters in alcoholic beverage characterization. 1-Pentanol has very narrow use, because it occurred significantly in only 1 brand. 1-Butanol and 2-butanol show intermediate possibilities. 1-Hexanol had wide distributions, and was judged best of the 4 as a parameter. A distinction was shown between 2 brands, similar in other parameters, on the basis of the 1-hexanol content of each. In a 7-year survey, 1-hexanol was consistently characteristic for a single brand. All analyses were done using dual columns, dual flame ionization detectors in a gas-liquid chromatographic system, employing temperature programming from 50 to 150°C. Columns contained 2% Carbowax 20M, 3% Carbowax 1500, and 1% mineral oil on 45—60 mesh Chromosorb G. In addition to the 4 congeners mentioned, the following are also separated by this procedure: acetaldehyde, methyl acetate, ethyl acetate, methanol, 1-propanol, isobutyl alcohol, isoamyl acetate, isoamyl alcohol, hexyl acetate, ethyl caprylate, and 2-furfural.

The time-dependent electric current from a flame

1984 ◽  
Vol 393 (1805) ◽  
pp. 297-308 ◽  
Keyword(s):  
Differential Equation ◽  
Electric Field ◽  
Electric Current ◽  
Diffusion Flame ◽  
Time Dependent ◽  
Two Dimensional ◽  
Ionization Detector ◽  
Flame Ionization ◽  
Dependent Potential ◽  
Ionization Detectors

An earlier static treatment of the electric current from the diffusion flame in a flame ionization detector has been extended to include time-dependent currents. The nonlinear differential equation describing the electric field in the space outside the flame has been solved analytically for a class of problems in which a time-dependent potential difference is switched on after a static current has been established. Both one- and two-dimensional geometrical configurations are considered. The results could be useful in suggesting new experiments on flame ionization detectors.

Flame-ionization detectors for the analysis of some inorganic gases

1979 ◽  
Vol 178 (1) ◽  
pp. 364-368
Author(s):  
P. Russev ◽  
M. Kunova ◽  
V. Georev
Keyword(s):  
Flame Ionization ◽  
Ionization Detectors
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