When you use this ERM, please carefully break open the ampoule at the neck and pipette 15 ml from the ampoule into 250 ml volumetric flask and bring to volume by formaldehyde solution.

• 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，用甲醛吸收液定容。