Discussion
Consider the following statements about gas supply and maintenance.
1. Oxygen degrades the stationary phase at high temperature
2. A column should be conditioned before first use
3. Exceeding the maximum temperature briefly does no harm
Which of the statements given above is or are correct?
Answer: D
The first two are correct and the third is false: the phase decomposes irreversibly above its limit, and even a brief excursion costs efficiency and raises bleed permanently. A maximum temperature is a destruction threshold rather than a performance guideline, which is why the oven's programme is checked before an unfamiliar column is installed.
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