Ad
related to: gas chromatography retention volume
Search results
Results from the WOW.Com Content Network
Gas chromatography (GC) is a common ... the volume injected, V inj, ... Retention time can be used to identify analytes if the method conditions are constant. Also ...
In gas chromatography, the Kovats retention index (shorter Kovats index, retention index; plural retention indices) is used to convert retention times into system-independent constants. The index is named after the Hungarian-born Swiss chemist Ervin Kováts , who outlined the concept in the 1950s while performing research into the composition ...
The resulting chromatogram is therefore a weight distribution of the polymer as a function of retention volume. GPC chromatogram; V o = no retention, V t = complete retention, A and B = partial retention. The most sensitive detector is the differential UV photometer and the most common detector is the differential refractometer (DRI).
A known volume of headspace gas is then injected onto a gas chromatographic column. An automated process can also be utilized. An automated process can also be utilized. Individual components (gases) are separated and detected by either a thermal conductivity detector (TCD), a flame ionization detector (FID), or an electron capture detector (ECD).
The mass spectrometry process normally requires a very pure sample while gas chromatography using a traditional detector (e.g. Flame ionization detector) cannot differentiate between multiple molecules that happen to take the same amount of time to travel through the column (i.e. have the same retention time), which results in two or more ...
Example chromatogram showing signal as a function of retention time. In chromatography, resolution is a measure of the separation of two peaks of different retention time t in a chromatogram. [1] [2] [3] [4]
Pyrolysis–gas chromatography–mass spectrometry is a method of chemical analysis in which the sample is heated to decomposition to produce smaller molecules that are separated by gas chromatography and detected using mass spectrometry. Pyrolysis is the thermal decomposition of materials in an inert atmosphere or a vacuum.
The residence time of a fluid parcel is the total time that the parcel has spent inside a control volume (e.g.: a chemical reactor, a lake, a human body).The residence time of a set of parcels is quantified in terms of the frequency distribution of the residence time in the set, which is known as residence time distribution (RTD), or in terms of its average, known as mean residence time.
Ad
related to: gas chromatography retention volume