The FTIR Detector

The main disadvantage of simple mass spectrometry detection is its inability to distinguish between many positional isomers. The technique ideally suited to give such information and the presence of functional groups such as CO and OH is IR spectroscopy. Conventional IR spectroscopy with a grating is too slow for GC purposes but FTIR has the required speed provided that sufficient computing power is available (the computing power required is considerably greater than that required for other techniques). Another disadvantage is that the spectra obtained are gas phase spectra whereas IR spectral libraries have been traditionally liquid phase spectra. The main disadvantages, however, are the wide variation in extinction coefficients, the rather poor sensitivity for many compounds (the upper nanogram range) and light pipe cells with a relatively large dead volume.

Since capillary GC seems to be moving in the direction of faster separations via short, very narrow bore capillaries it seems doubtful if GC-FTIR will ever find any great application except perhaps in niche application areas such as essential oil and perfumery analysis.

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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