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 1% HNO3 solution.

• 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1%25硝酸定容。