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Resolution (chromatography) 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]
IUPAC definition. The IUPAC definition for resolution in mass spectrometry is. Where a larger resolution indicates a better separation of peaks. [1][2] This definition is used in a number of mass spectrometry texts. [3][4][5][6][7][8][9][10][11] This use is also implied by the term "high-resolution mass spectrometry." [12]
Purnell equation. The Purnell equation is an equation used in analytical chemistry to calculate the resolution Rs between two peaks in a chromatogram. [1] [2] where. Rs is the resolution between the two peaks. N2 is the plate number of the second peak. α is the separation factor between the two peaks. k ' 2 is the retention factor of the ...
Gas chromatography–mass spectrometry. Gas chromatography–mass spectrometry (GC–MS) is an analytical method that combines the features of gas-chromatography and mass spectrometry to identify different substances within a test sample. [1] Applications of GC–MS include drug detection, fire investigation, environmental analysis, explosives ...
The van Deemter equation is a hyperbolic function that predicts that there is an optimum velocity at which there will be the minimum variance per unit column length and, thence, a maximum efficiency. The van Deemter equation was the result of the first application of rate theory to the chromatography elution process.
The response factor can be expressed on a molar, volume or mass [1] basis. Where the true amount of sample and standard are equal: = where A is the signal (e.g. peak area) and the subscript i indicates the sample and the subscript st indicates the standard. [2]
Gas chromatography is the process of separating compounds in a mixture by injecting a gaseous or liquid sample into a mobile phase, typically called the carrier gas, and passing the gas through a stationary phase. The mobile phase is usually an inert gas or an unreactive gas such as helium, argon, nitrogen or hydrogen. [1]
Mass spectrometry. Mass spectrometry (MS) is an analytical technique that is used to measure the mass-to-charge ratio of ions. The results are presented as a mass spectrum, a plot of intensity as a function of the mass-to-charge ratio. Mass spectrometry is used in many different fields and is applied to pure samples as well as complex mixtures.