An analytical chemistry technique in which a sample is vaporized and passed through a column whose walls are covered with a sticky organic solvent; different chemicals in the sample have different affinities for the solvent and separate as they pass through the column.
A separation technique involving passage of a gaseous moving phase through a column containing a fixed adsorbent phase; it is used principally as a quantitative analytical technique for volatile compounds.
a method of separating chemical components of a mixture, which involves the passage of a gaseous sample through a column having a fixed adsorbent phase
Analytical process by which chemical mixtures are separated into individual components for quantitative and perhaps qualitative analysis.
A chromatographic separation technique in which the substance (or mixture) to be analyzed is vaporized and diffused along with a carrier gas through a liquid or solid for differential adsorption.
(GC, GLC) - a form of chromatography where the mobile phase is gas.
Type of automated chromatography. Sample is dissolved in a solution, vaporized and carried by inert gas through a column to the detector. Sample components are separated from each other by passage through the column which is packed with an absorbent or adsorbent. Each component produces a separate peak in the detector output which is graphed by a chart recorder. See CHROMATOGRAPHY.
chromatographic method in which a carrier gas (inert) distributes the vapor being analyzed in a packed column.
(also known as Gas Liquid Chromatography): The separation of organic liquids or gases into discrete components or compounds seen as peaks on a chromatogram. Separation us done in a column which is enclosed in an oven held at a specific temperature, or programmed to change temperature at a reproducible rate. The column separates the compounds according to their affinity for the material inside the column (stationary phase). Columns can be either packed or capillary. Packed columns employ a powdery substance which may be coated with a nonvolatile liquid phase. A capillary column is a glass or quartz tube coated with a nonvolatile liquid. Gas Chromatography (GC) is the accepted method for identification of hydrocarbon mixtures normally used as accelerants, and must be performed in order to have a valid identification of petroleum distillates.
A process in which the specimen is vaporized and injected into a stream of carrier gas (as nitrogen or helium) moving through a column containing a stationary phase composed of a liquid or particulate solid and is separated into its component compounds.
The separation of a mixture of compounds into its separate components by injecting them into a moving gas stream. This stream is passed round a long tube and the compounds injected into it move at different speeds. The presence of the compounds is detected at the far end of the tube by a meter. Half life : The time taken for a radioactive element to decay to half its initial mass.
usually refers to gas-liquid chromatography where the mobile phase is a gas (helium, hydrogen or nitrogen typically) and the stationary phase is an immobolized liquid bound to a support material.
(GC): A separation process in which a sample is injected into a stream of carrier gas moving through a column containing a stationary phase composed of a liquid or particulate solid and is separated into its component compounds according to their affinity for the stationary phase.
Analytical technique for separating compounds of a sample and qualitatively and quantitatively identifying them.
another test used to characterize waxes, most useful for relatively simple structures of vegetable and insect waxes, GC has limited utility on petroleum and synthetic waxes. Good resolution can be had on products with one preponderant structure, e.g. paraffins with a preponderance of primary alkanes. Products such as microcrystalline wax, which contain several different branched isomers for each carbon number plus some cyclic compounds cannot be completely resolved, but useful information can still be had.
An analysis tool which is used to determine the chemical make-up plant extracts. Chromatography is the process in which a substance is separated into its components and diffused, along with a carrier gas, through a liquid or solid adsorbent for differential adsorption.
An analytical method of determining with great accuracy the composition of volatile solvents and oils and determining their residual presence in inert materials such as paper and film.
The sample mixture is vaporized in gas chromatography. The process by which a vaporized mixture is separated into its component compounds.[23
Gas chromatography is the process of separation and analysis of different substances according to their different attraction to a standard absorbent substance.
A gaseous detection technique which involves the separation of mixtures by passing them through a column that will enable the components to be held up for varying periods of time before they are detected and recorded.
Analytical separation technique where the minor components in a mixture of gases are separated and resolved into individual components. The technique requires the transmission of the gas sample through a column in the chromatograph using a mobile phase or carrier gas. The column is either packed or coated with a material for which the gases to be separated have an affinity and the strength of this affinity largely determines the time any individual component is retained in the column. Various detectors are employed in gas chromatography, from very specific compound-responsive detectors (flame photometric detector, electron capture detector, photoionization detector, etc.) to some very generally sensitive detectors (flame ionization detector, thermal conductivity detector, atomic emission detector, etc.) Gas chromatography is commonly used for the quantification of halocarbons and hydrocarbons in the atmosphere.