Reconcentration of Bands Broadened by Split Injection

Cold trapping If the difference between the column temperatures at injection and elution is >45°C (approx.), then material of low volatility is retained by the cold column and migrates only a small distance before transfer from the injector is complete; it starts to migrate only when the oven temperature is increased. The extent of reconcentration depends on the ratio of the migration rates of the volatile and involatile components. Because the migration speeds of most components are halved if the temperature is reduced by 15°C, there is a concentration factor of 2 for each 15°C difference between the column temperatures at injection and elution. A difference of 80°C will always render any band broadening resulting from injection undetectable and in normal circumstances a difference of 40-60°C will be sufficient.

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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