When you use this ERM, please carefully break open the ampoule at the neck and pipet 15 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15毫升干燥洁净移液管从安瓿中准确移取浓样15毫升于250毫升容量瓶中，用纯水定容。