Results 101 to 110 of about 94,683 (164)

On-line multidimensional chromatography using packed capillary liquid chromatography and capillary gas chromatography

Journal of High Resolution Chromatography, 1985
AbstractThe introduction of selected fractions from a liquid chromatograph into a gas chromatograph has been described; however, analyses were performed by off‐line experiments requiring collection and reinjection of the separate fractions or by on‐line procedures where disadvantageously, only a fraction of the separated peak or a well resolved ...
B E Richter
exaly   +2 more sources

Capillary gas chromatography of s-triazines

Journal of Chromatography A, 1977
In order to achieve better resolution and lower detection limits for s-triazines, glass capillary columns made of soft soda-lime glass and etched with gaseous hydrogen chloride have been introduced. Columns with non-polar (OV-101, SE-30) mixed (Carbowax 20M + SE-30) and polar stationary liquids (Carbowax 20M) were used.
E, Matisová, J, Krupcik
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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
openaire   +1 more source

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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Two-stage capillary gas chromatography

Analytica Chimica Acta, 1967
Abstract A two-stage capillary gas-chromatographic method has been developed with the aim of obtaining a better separation of the saturated hydrocarbons from petroleum in the C10–C18 molecular weight range. The method should also be applicable to other hydrocarbon fractions and to compounds other than hydrocarbons.
P A, Schenck, C H, Hall
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Potentials of capillary gas chromatography in toxicology today

Zeitschrift f�r Rechtsmedizin, 1984
The usefulness, the applicability and the limitations of capillary gas chromatography in various types of toxicological analysis were discussed. Technical parameters of capillary gas chromatography, such as type of injector, type of column with regard to material, size, and stationary phase were assessed in view of the requirements of toxicological ...
BOGUSZ, M, DEZEEUW, RA, FRANKE, JP
openaire   +3 more sources

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
openaire   +1 more source

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 ...
openaire   +2 more sources