existent on this column. The retention times for the components also are constant regardless of sample composition. As little as 2 µg of MMH or N2H4 in a 3-µ1 water sample was detectable, resolved, and produced symmetrical peaks on column A. This indicates that only normal solvent-solute interactions are responsible for the separation on this column. Other columns such as F and G showed appreciable adsorption of H20, MMH, and N2H4 when the sample size was below 0.5 Ml.Column Stability. 2-Hydrazinopyridine is a strongly alkaline material and reacts rapidly with C02. Columns such as A, B, or C are stable for 6 to 10 days if some helium flow is maintained at all times; however, they deteriorate rapidly if exposed to the atmosphere for several days. Thermogravimetric analysis of 2-hydrazinopyridine indicates that significant vaporization losses occur above 80°C. Solvents with higher boiling points would be an advantage; however, chemical similarity should be maintained.
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