A portable gas chromatograph with air carrier gas for the determination of explosive traces

2013 ◽  
Vol 68 (11) ◽  
pp. 1002-1006 ◽  
Author(s):  
M. N. Baldin ◽  
V. M. Gruznov
Keyword(s):  
Gas Chromatograph ◽  
Carrier Gas ◽  
Air Carrier ◽  
Portable Gas Chromatograph

scholarly journals Air pollution in landfill of wastes other than hazardous or inert / Zanieczyszczenia powietrza na składowiskach odpadów innych niż niebezpieczne i obojętne

2015 ◽  
Vol 41 (2) ◽  
pp. 41-46 ◽  
Author(s):  
Ewa Miaśkiewicz-Pęska ◽  
Mirosław Szyłak-Szydłowski
Keyword(s):  
Air Pollution ◽  
Chemical Analysis ◽  
Microscopic Fungi ◽  
Gas Chromatograph ◽  
Psychrophilic Bacteria ◽  
Air Samples ◽  
Atmospheric Air ◽  
Bacteria And Fungi ◽  
Portable Gas Chromatograph

Abstract Microbiological and chemical analysis of air was carried out on the area of landfill of wastes other than inert or hazardous. The landfill covers 20 ha and 40 000 Mg of wastes is deposited annually. Municipal waste is not segregated at the landfill. The research was conducted in April, May and November 2012. Number of the psychrophilic and mesophilic bacteria and fungi was estimated by a culture-based method. Quantitative determination of sulfur compounds and meteorological and olfactrometric examinations were also carried out. Chemical analysis was conducted with a Photovac Voyager portable gas chromatograph. Air samples were collected at 5 points. The largest group of microbes were psychrophilic bacteria, especially in summer. The highest concentration of hydrogen sulfide and other odorants was found at leachate tank and landfill body. According to the Polish Standard for the assessment of atmospheric air pollution the air in the area of the landfill is classified as not contaminated and sporadically moderately contaminated. In spring and summer the number of microscopic fungi was increased also in control samples.

Determination of CO2 in Wines by Gas Chromatography

1964 ◽  
Vol 47 (4) ◽  
pp. 730-734
Author(s):  
Howard L Ashmead ◽  
Glenn E Martin ◽  
John A Schmit
Keyword(s):  
Gas Chromatography ◽  
Direct Method ◽  
Alcoholic Beverages ◽  
Gas Chromatograph ◽  
Injection Port ◽  
Carrier Gas ◽  
Solid Adsorbent ◽  
Partial Pressures ◽  
Injection Port Temperature

Abstract A fast and direct method is presented for the determination of CO2 in wines. Partial pressures from other ingredients of alcoholic beverages do not interfere. The method was compared to the manometric procedure under vacuum. An F & M Model 450 Gas Chromatograph with a filament detector was used for C02 determinations. Components were separated by a column 9” long and 1/8” o.d. using charcoal (60—80 mesh) as solid adsorbent. Injection port temperature was ambient; detector and column temperatures were 40°C. Helium was used as a carrier gas at the rate of 50 ml/min. Approximately 50 μ1 samples of standard and unknown solutions were used for the respective determinations.

Portable Gas Chromatograph with Tunable Retention and Sensor Array Detection for Determination of Complex Vapor Mixtures

2003 ◽  
Vol 75 (6) ◽  
pp. 1400-1409 ◽  
Author(s):  
Chia-Jung Lu ◽  
Joshua Whiting ◽  
Richard D. Sacks ◽  
Edward T. Zellers
Keyword(s):  
Sensor Array ◽  
Gas Chromatograph ◽  
Array Detection ◽  
Vapor Mixtures ◽  
Portable Gas Chromatograph

On-site determination of nerve and mustard gases using a field-portable gas chromatograph-mass spectrometer

2006 ◽  
Vol 24 (1) ◽  
pp. 17-22 ◽  
Author(s):  
Hiroyuki Sekiguchi ◽  
Koji Matsushita ◽  
Shigeharu Yamashiro ◽  
Yasuhiro Sano ◽  
Yasuo Seto ◽  
...  
Keyword(s):  
Mass Spectrometer ◽  
Gas Chromatograph ◽  
Portable Gas Chromatograph

scholarly journals New Method of Denitrification Analysis of Bradyrhizobium Field Isolates by Gas Chromatographic Determination of 15N-Labeled N2

2004 ◽  
Vol 70 (5) ◽  
pp. 2886-2891 ◽  
Author(s):  
Reiko Sameshima-Saito ◽  
Kaori Chiba ◽  
Kiwamu Minamisawa
Keyword(s):  
Thermal Conductivity ◽  
Detection Limit ◽  
Bradyrhizobium Japonicum ◽  
Chromatographic Determination ◽  
New Method ◽  
Thermal Conductivity Detector ◽  
Gas Chromatograph ◽  
Carrier Gas ◽  
Field Isolates

ABSTRACT To evaluate the denitrification abilities of many Bradyrhizobium field isolates, we developed a new 15N-labeled N2 detection methodology, which is free from interference from atmospheric N2 contamination. 30N2 (15N15N) and 29N2 (15N14N) were detected as an apparent peak by a gas chromatograph equipped with a thermal conductivity detector with N2 gas having natural abundance of 15N (0.366 atom%) as a carrier gas. The detection limit was 0.04% 30N2, and the linearity extended at least to 40% 30N2. When Bradyrhizobium japonicum USDA110 was grown in cultures anaerobically with 15NO3 −, denitrification product (30N2) was detected stoichiometrically. A total of 65 isolates of soybean bradyrhizobia from two field sites in Japan were assayed by this method. The denitrification abilities were partly correlated with filed sites, Bradyrhizobium species, and the hup genotype.

Improved Cleanup and Derivatization for Gas Chromatographic Determination of Monosodium Glutamate in Foods

1983 ◽  
Vol 66 (6) ◽  
pp. 1528-1531 ◽  
Author(s):  
Hiroshi Nakanishi
Keyword(s):  
Glutamic Acid ◽  
Acid Derivative ◽  
Monosodium Glutamate ◽  
Chromatographic Determination ◽  
Flame Ionization Detection ◽  
Gas Chromatograph ◽  
Flame Ionization ◽  
Acetone Water ◽  
Chromatographic Procedure

Abstract A gas chromatographic procedure is described for determining monosodium glutamate (MSG) in several types of food. A sample is extracted with acetone- water (1 + 1). Acetone is evaporated and an aliquot of the extract is buffered with 1M NH4OH-1M NH4CI pH 9 solution, and chromatographed directly on a column of QAE Sephadex A-25 that has been pretreated with the same buffer. MSG is eluted with 0.1N HC1, and a portion of the eluate is evaporated to dryness and reacted with dimethylformamide( DMF)-dimethylacetal to form the glutamic acid derivative, which is injected into a gas chromatograph and measured by flame ionization detection. Recoveries of MSG from sample fortified at 5-500 mg ranged from 92.8 to 100%.

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