Results 251 to 260 of about 209,682 (308)

Nitrate analysis by capillary gas chromatography

Analytical Biochemistry, 1990
A microanalytical gas chromatographic (GC) method for the analysis of nitrate in rat urine is described. The method involves the conversion of nitrate to nitromesitylene and quantitation using 3,4-dimethylnitrobenzene as an internal standard. The nitroaromatics were separated on a wide-bore capillary column and detected with a nitrogen-phosphorus ...
M J, Dunphy, D D, Goble, D J, Smith
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Capillary gas chromatography of n-alkyness

Journal of Chromatography A, 1976
Abstract The Kovats retention indices ( I of C 6 C 14 n -alkynes on squalane (SQ), Apiezon L (ApL), polyphenyl ether (PFE) and polyethylene glycol 4000 (PEG) vary relatively slightly with temperature ( T ) in the range 60–190°C. On SQ the I values of internal n -alkynes decrease and on PEG and PFE they increase with increase in T , while 1 ...
S. Rang, K. Kuningas, A. Orav, O. Eisen
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On-line sample treatment—capillary gas chromatography

Chromatographia, 1998
Sample pretreatment is often the bottleneck of a tracelevel analytical procedure. In order to increase performance, increasing attention is therefore being devoted to combining sample pretreatment on-line with the separation technique that has to be used.
Goosens, E.C., Jong, D., Jong, G.J., Brinkman, U.A.T.   +3 more
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Capillary gas chromatography of azaarenes

Journal of Chromatography A, 1982
Abstract Reproducible methods for the preparation of non-polar, medium-polar and polar capillary columns with suitable wall surface deactivation for the analysis of nitrogen bases are described. Parameters affecting deactivation, efficiency and thermal stability are discussed.
J.M. Schmitter, I. Ignatiadis, G. Guiochon   +2 more
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Capillary gas-solid chromatography

Russian Chemical Reviews, 1996
The current state of gas adsorption chromatography on open tubular capillary columns is analysed. The history of the development of this method and its role in gas chromatography are considered. The preparation of open tubular adsorption capillary columns, fundamentals of the theory of retention and of broadening of chromatographic zones, and the use ...
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Capillary gas chromatography of carbolines

Journal of Chromatography A, 1982
Abstract A method was developed for the gas chromatographic analysis of carbolines (pyridoindoles) on fused-silica glass capillary columns, coated with SuperoxTM-4. Separation characteristics are presented for all four possible isomers of carboline and several methyl-, methoxy- and dihydro-derivatives fo β-carboline (norharman).
M.E. Snook, O.T. Chortyk
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Capillary gas chromatography of lupin alkaloids

Journal of Chromatography A, 1983
The resolution and identification of twelve lupin alkaloids are demonstrated using capillary gas chromatography and gas chromatography-mass spectrometry. The quantitative capabilities of capillary gas chromatography are illustrated by specific reference to the four major alkaloids of lupinus angustifolius, namely lupanine, 13-hydroxylupanine ...
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Analysis of alkylbenzene samples by comprehensive capillary liquid chromatography×capillary gas chromatography

Journal of Chromatography A, 2008
The constituents in synthetic alkylbenzene samples were analyzed by a comprehensive capillary liquid chromatography (micro-LC) x capillary gas chromatography (CGC). The micro-LC separates the mixture into aliphatic compounds, monosubstituted alkylbenzenes, multisubstituted alkylbenzenes and binuclear aromatic compounds.
Yuan, Xu, Hua, Wang, Jinghong, Zhao, Yafeng, Guan   +3 more
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Introduction to pyrolysis–capillary gas chromatography

Journal of Chromatography A, 1999
By breaking large molecules into characteristic smaller fragments, analytical pyrolysis extends the use of gas chromatography to the analysis of polymeric materials, including natural polymers such as cellulose as well as synthetics. An understanding of the chemistry involved permits interpretation of the information present in these molecular ...
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Pulse circulation gas chromatography on capillary columns

Talanta, 1987
The method and equipment for pulse circulation high-resolution gas chromatography on glass capillary columns have been developed. The separation of a mixture of C(6)H(6), C(6)H(5)D, C(6)H(3)D(3) and C(6) D(6) on carbonized columns coated with squalane has been taken as an example to show the advantages of the method.
V P, Chizhkov, S S, Pavlov, N V, Sterkhov, V M, Ravikovich, E F, Litvin, E A, Varyvonchik   +5 more
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