volumetric flask

基本解释

Standard preparation —Weigh accurately 100 mg of USP Papain RS in a 100-mL volumetric flask. And add Buffer solution to dissolve.
标准试剂—精确称取100mg RS级USP木瓜蛋白酶置于100mL容量瓶中，加入缓冲溶液使之溶解，再用缓冲溶液定容至刻度，混匀。
Dilute with Buffer solution to volume, and mix. Transfer 2.0 mL of this solution to a 50-mL volumetric flask, dilute with Buffer solution to volume, and mix.
移取2.0mL此溶液置于50mL容量瓶中，然后用缓冲溶液定容至刻度，混匀。
When you use this ERM, please carefully break open the ampoule at the neck and pipet 10 ml from the ampule into 250 ml volumetric flask and bring to volume by laboratory-pure water.
临用时割开安瓿，用10毫升干燥洁净移液管从安瓿中准确移取浓样10 毫升于250 毫升容量瓶中，用纯水定容。