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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。
苯酚(有毒,具有挥发性)在常温下是固体,比较硬称量时,不好取.我同事都是用铁棒敲碎才取出来的水浴加热待其溶解,但是我们通风柜里没水浴加热装置我同事的办法我觉得不太可取如果要加热是拿着整瓶加热还是?
恒重:同一物体经过两次热处理并冷却后称量之差小于0.0003g。各位老师,这个是我在一个资料上看到的,这个解释出自哪里?有知道的吗?