scholarly journals Determination of fatty acid compositions of Bacillus cereus and related bacteria: a rapid gas chromatographic method using a glass capillary column.

1978 ◽  
Vol 35 (2) ◽  
pp. 453-455 ◽  
Author(s):  
A Niskanen ◽  
T Kiutamo ◽  
S Räisänen ◽  
M Raevuori
Keyword(s):  
Fatty Acid ◽  
Bacillus Cereus ◽  
Chromatographic Method ◽  
Capillary Column ◽  
Glass Capillary Column ◽  
Glass Capillary ◽  
Gas Chromatographic Method ◽  
Fatty Acid Compositions

scholarly journals Parameters Affecting the Selective Filtration of Certain Tobacco Smoke Components

1975 ◽  
Vol 8 (3) ◽  
Author(s):  
Gerald P. Morie ◽  
Cephas H. Sloan ◽  
Madelyn S. Baggett
Keyword(s):  
Cigarette Smoke ◽  
Tobacco Smoke ◽  
Chromatographic Method ◽  
Capillary Column ◽  
Distribution Coefficients ◽  
Glass Capillary Column ◽  
Glass Capillary ◽  
Selective Filtration ◽  
Gas Chromatographic Method

AbstractThe purpose of this investigation was to attain a better understanding of the selective removal of certain compounds from cigarette smoke by filters. A gas chromatographic method for the determination of selected semivolatile smoke compounds was developed. The method, which utilizes a 160 m glass capillary column, was used to determine the efficiency of filters for the removal of these selected semivolatile compounds. A correlation was found between the selective filtration of these compounds from cigarette smoke and their distribution coefficients [KSwhere b

scholarly journals Determination of N-Nitrosodimethylamine in the Smoke of High-Nitrate Tobacco Cigarettes

1973 ◽  
Vol 7 (2) ◽  
Author(s):  
G.P. Morie ◽  
C.H. Sloan
Keyword(s):  
Capillary Column ◽  
Glass Capillary Column ◽  
Gas Chromatograph ◽  
Ionization Detector ◽  
Glass Capillary ◽  
Flame Ionization ◽  
Basic Solutions ◽  
Poly Ethylene ◽  
Gas Chromatographic Method

AbstractA gas chromatographic method was developed for the determination of N-nitrosodimethylamine (NDMA) in cigarette smoke. The NDMA in the smoke of 200 cigarettes was trapped in a solution of sodium hydroxide and separated from most of the smoke components by distillation from acidic and basic solutions. The aqueous solution was extracted for 8 hr. into ethyl ether in a Dean Stark apparatus. To concentrate the solution of NDMA, the ether was distilled until only 5 ml of the solution remained. An aliquot of this solution was analysed by means of a gas chromatograph equipped with a 200-ft. glass capillary column coated with Carbowax 20-M poly(ethylene glycoI). An alkali metal flame ionization detector with a selectivity of 10*/1 for nitrogen compounds to normal hydrocarbons was used. Small amounts (2 ng) of nitrosamines in the presence of large amounts of other compounds were easily detected. N-nitrosodimethylamine-C

Capillary Column Gas Chromatographic Determination of Trace Residues of the Herbicide Chlorsulfuron in Agricultural Runoff Water

1987 ◽  
Vol 70 (4) ◽  
pp. 745-748
Author(s):  
Uaz Ahmad
Keyword(s):  
Gas Chromatography ◽  
Chromatographic Method ◽  
Capillary Column ◽  
Methylene Chloride ◽  
Chromatographic Determination ◽  
Agricultural Runoff ◽  
Runoff Water ◽  
Florisil Column ◽  
Gas Chromatographic Method

Abstract A capillary column gas chromatographic method is described for determining parts-per-trillion (ppt) levels of chlorsulfuron in agricultural runoff water. The water sample is acidified with acetic acid and extracted with methylene chloride. The chlorsulfuron in the extract is derivatized to its monomethyl derivative. After Florisil column cleanup, the methylated chlorsulfuron is determined by electron-capture gas chromatography. Recovery of chlorsulfuron from fortified water samples is greater than 80%. Detection limit of the method is 25 ng chlorsulfuron/L water (25 ppt). There are 2 reaction sites on the chlorsulfuron molecule, both of which are susceptible to methylation leading to monomethyl chlorsulfuron and dimethyl chlorsulfuron. A procedure is described to methylate selectively the sulfonamide nitrogen of chlorsulfuron.

Determination of Polychlorinated Dibenzo-p-dioxins and Dibenzofurans in Commercial Pentachlorophenols by Combined Gas Chromatography-Mass Spectrometry

1976 ◽  
Vol 59 (3) ◽  
pp. 562-569 ◽  
Author(s):  
Hans-Rudolf Buser ◽  
Hans Paul Bosshardt
Keyword(s):  
Capillary Column ◽  
Gas Chromatography Mass Spectrometry ◽  
Glass Capillary Column ◽  
Specific Method ◽  
Mass Fragmentography ◽  
Glass Capillary ◽  
Mass Spectral Analysis ◽  
Mass Spectral ◽  
Gas Chromatographic Separation

Abstract Samples of commercial pentachlorophenol (PCP) and its sodium salt (PCP-Na) were examined for the presence of polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs), using a rapid, highly specific method of analysis. Phenolic compounds are removed by alkaline extraction, and the neutral components are fractionated on an alumina minicolumn. After gas chromatographic separation, individual PCDDs and PCDFs are detected by mass fragmentography and their presence is confirmed by complete mass spectral analysis. While some samples had only low amounts of PCDDs and PCDFs, others contained much higher amounts of these components. PCP-Na samples showed the unexpected presence of a tetrachlorodibenzo-p-dioxin. Re-analysis of PCP and PCP-Na samples with high PCDD contents on a high-resolution glass capillary column showed the presence of 3 hexa- and the 2 heptachlorodibenzo-p-dioxins with nearly constant isomeric ratios.

Sign in / Sign up

Export Citation Format

Share Document