主题：【讨论】大家有碰到晶体状标准品无法称量的情况吗？怎么处理？

我们客户地能订购了1瓶BFDGE-2H2O 标准品（双酚F二缩水甘油醚二水化合物），据客户反映，用的时候产品都黏在瓶子底部，刮也刮不下来，请问大家有没有碰到这样的现象？如何处理？

之前链接上http://www.docin.com/p-428083595.html 有篇文章，也是做双酚F二缩水甘油醚的，是用甲醇溶解的，现在我们客户打算用四氢呋喃溶解。

于是我们与供货商沟通了解该产品如何取样和溶解，供货商回复如下：

This chemical(BFDGE-2H2O) is pasty and sticky in its natural form. DMSO, acetonitrile and dioxane are possible solvents to dissolve it. If you run HPLC method, I think you should try acetonitrile first. Have a small amount onto a glass tip and see if it dissolve in acetonitrile. If you worry about losing too much in transferring and weighing, you can weigh the whole vial first before dissolving it all in a solvent such as acetonitrile. Then carefully transfer solution and wash solvents (two to three washes) to a volumetric flask. After you dry the vial, weight difference between the vial with the chemical and empty vial will give you the total weight of the chemical originally inside the vial which has been all dissolved and transferred to the volumetric flask.

我后来建议客户换成金属药勺试试，结果还没有出来，我估计还是可以称量出来的。