what are the three types of injections with GC and when they should be used. Explain...

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Chemistry

what are the three types of injections with GC and when theyshould be used. Explain why cold trapping and solvent trapping areused and what they are.

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1Direct Injection 2Split Injection 3Splitless Injection Are the three types of injections used in GC The injection system should fulfill the following requirements i The injected amount should not overload the column iiThe injection bandwidth should be small compared to the band broadening effects in the capillary column iiiThe column should be able to achieve its optimum separation efficiency ivSample composition should remain intact No discrimination should occur on basis of boiling point polarity concentration or thermal stability v Applicable to trace analysis as well as high concentration samples vi The injected amount should be reproducible Direct Injection Volumes 01 L 1 L Concentration Range 1 ppm levels i Direct injection is the most commonly used injection technique for packed columns and 053 mm ID columns Its major advantages are its ease See Answer

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