Preparative Layers

These are thicker layers of any of the above sorbents to allow larger quantities of sample solutions to be applied. These layers are 0.5, 1 or 2 mm thick (compared to the usual analytical thickness of 0.25 mm). Usually the sample is applied to the plates as a streak by some automatic device. The thicker the layer, the more sample solution that can be applied (Figure 6). Such a plate is used in the traditional manner, but will generate greater heat of solvation if using a silica plate with a developing solvent with a polar modifier. This will make spots or bands travel faster, and a readjustment of the solvent ratios may be necessary to reduce the band travel.

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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