During densitometric evaluation of a planar chromatogram, its separation tracks are scanned with a light beam in the form of a slit adjustable in length and width. The photosensor of the densitometer measures diffusely reflected light. The difference between the optical signal from the sample-free background and that from a sample zone (fraction) is correlated with the amount of the respective fractions of calibration standards chromatographed on the same plate. Densitometric measurements of planar chromatograms can be made by absorbance or by fluorescence.

As an alternative to classical densitometry, a planar chromatogram can be evaluated by video technology.

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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