What is the blow-by phenomenon of syringe handling in gas chromatography?
Answer:
A blow-by phenomenon is loading air first into the syringe , then sample, and finally more air.
This assures that there is no sample in the needle during insertion into the hot injector (which would volatilize and lead to pre-injection of part of the sample, resulting in doubled peaks) and that there is a backing of air to blow all of the sample into the injector quickly.
ref: http://www.chemistry.sjsu.edu/straus/gc%...
A solvent flush - flushes all the sample off the column, and prepares the column for a fresh sample. You load your syringe as you would for a sample, but with PURE solvent, and inject into the chromatograph. After the solvent has eluted - you are ready to run a fresh sample.
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