by on September 18, 2021
What is gas chromatography? Gas chromatography (GC) is an analytical technique used to separate the chemical components of a sample mixture and then detect them to determine their presence or absence and/or how much is present. These chemical components are usually organic molecules or gases. For GC to be successful in their analysis, these components need to be volatile, usually with a molecular weight below 1250 Da, and thermally stable so they don’t degrade in the GC system. GC is a widely...
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by on September 18, 2021
Spectrophotometry is a scientific technique used to measure the intensity of light either transmitted through or reflected from gas, liquid or solid samples.  In transmission, which is directly related to absorbance per Beer's law, spectrophotometry is the technique that measures how much a substance absorbs a beam of light passing through it.  By measuring the intensity at each wavelength, a spectrum is created and this can tell us much information about the sample through which the light passe...
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by on September 18, 2021
In the broadest sense a spectrometer is any instrument that is used to measure the variation of a physical characteristic over a given range; i.e. a spectrum. This could be a mass-to-charge ratio spectrum in the case of a mass spectrometer, the variation of nuclear resonant frequencies in an NMR spectrometer or the change in the absorption and emission of light with wavelength in an optical spectrometer. The most ubiquitous type of spectrometer used for research are optical spectrometers; and...
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