Computationally , no multiple extraction operations from sub - constituents to the same damain are possible 从?法操作上讲,在同一?域内对下位成分进?多项位式提取是?可能的。
The technique requires multiple extractions from the sample vial . this is very useful for developing method and running special sample 对于同一样品瓶的多次顶空提取,得到多个样品色谱图,用于方法的开发和对特种样品的分析。