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保留时间不重现有两种不同的情况:既保留时间漂移和保留时间波动。前者是指保留时间仅沿单方向发生变化,而后者指保留时间无固定规律的波动。将此两种情况区分开来对找到问题的原因往往很有帮助。如,保留时间的漂移往往由柱老化引起;而柱老化不可能引起保留时间的无规律波动。
There are two different cases of unreserved retention time: both retention time drift and retention time fluctuations. The former refers to the retention time changes only in one direction, while the latter refers to the retention time without any fixed fluctuations. It is often helpful to distinguish the two situations and find the cause of the problem. For example, drift in retention time is often caused by column aging; column aging can not cause irregular fluctuations in retention time.