A clean, drysample is weighed and then evacuated for several hours in a vacuum chamber, flushing with CO2 to remove remaining air if necessary.
将岩心样品洗净烘干并称重，然后把样品放到真空箱中抽空其内的空气（必要时充入CO2驱替掉空气）。
2
Ultrasonic extraction was used to extract the gypenosides from fresh leaves sample(F), fixed sample(X), baked sample(B), air-dried sample(A) and dry tea sample(D) of Gynostemma pentaphyllum.
用超声法提取绞股蓝鲜叶样、杀青样、烘干样、风干样以及绞股蓝袋泡茶干茶样的总皂甙， 并测定其含量。
3
The dry-ashed sample was dissolved in water. The solution was sprayed into the air-acetylene flame and the absorption at 330.2/330.3nmwas measured.