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Gas chromatography (GC) is a common type of chromatography used in analytical chemistry for separating and analyzing compounds that can be vaporized without decomposition ... Voir Plus
helium is the main one also hydrogen
You regenerate HPLC columns by flushing it with the following volumes of solvent. 20 column volumes of water/acetonitrile (95:5 v/v) 20 column volumes of acetonitrile 5 ... Voir Plus
by multiple washing with mobile phase they can be regenerate
separates ions and polar molecules based on their affinity to the ion exchanger