i want to analyze methanol and formaldehyde in water treated samples. We have a HP-5 column. What is the best column for separation of methanol and formaldehyde? What is the best condition for separation of these compounds in aqueous samples? What should the oven temperature be and the flow rate of the gas carrier? also what will be the best way to prepare sample for analysis. Can you give me suggestions for analysis of methanol and formaldehyde using GC-MS?