在外文中看到两种SPME的操作方式：equilibrium and pre-equilibrium。
原文是这么说的，在SPME标定方法（即定量）中，可以采取equilibrium and pre-equilibrium两种方法。
字面理解就是平衡法和预平衡法。
In one approach, a partitioning equilibrium between the sample matrix and extraction phase is reached. In this case, convection conditions do not affect the amount of analyte extracted. In a second approach using short pre-equilibrium extraction, if the convection/agitation is constant,the amount of analyte extracted is related to time. Quantification can then be performed based on timed accumulation of analytes in the coating.
Although equilibrium extraction does not require the convection/agitation to remain constant and the sensitivity is higher than pre-equilibrium approach, but if the time for equilibrium extraction is too long, then the pre-equilibrium extraction is better.
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