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葡萄糖干燥失重测定的操作过程
来源:http://www.jnjdbc.com 日期:2020-05-05 发布人:admin
1样品预处理
1 sample pretreatment
在样品容器内将样品充分混匀。如果样品容器太小,应将样品全部转移至容积适当的预干燥容器内,以便混匀。
Mix the sample well in the sample container. If the sample container is too small, transfer all the samples to a pre drying container with proper volume for mixing.
2 称量皿的准备
2 preparation of weighing dish
将敞开的称量皿(3.2)和盖置于干燥箱(3.3)中,在100 ℃下干燥1 h后移入干燥器(3.6)内,冷却至室温,称量,精确至0.0002 g。
Put the open weighing dish (3.2) and cover in the drying box (3.3), dry at 100 ℃ for 1 h, and then transfer them into the dryer (3.6), cool them to room temperature, weigh them to the nearest 0.0002 G.
3称样
3 weighing sample
称取大约10 g无水葡萄糖或5g一水葡萄糖于称量皿中,盖好盖,精确至0.0002g。
Weigh about 10 g of anhydrous glucose or 5g of monohydrate glucose into the weighing dish, cover well, accurate to 0.0002g.
无水葡萄糖
4测定
4 Determination
将装有样品、盖好盖的称量皿置于干燥箱(3.3)内,移开盖,在100 ℃士1 ℃烘干4 h,压力不超过13500Pa,在干燥过程中,通过干燥系统(3.5)缓慢地向干燥箱内注入气流。
Place the weighing dish with the sample and cover in the drying box (3.3), remove the cover, dry for 4H at 100 ℃ ± 1 ℃, and the pressure shall not exceed 13500pa. During the drying process, slowly inject air into the drying box through the drying system (3.5).
4h后,关闭真空泵(3.4),使空气缓慢通过干燥系统进入干燥箱内,直到干燥箱的压力恢复至常压。取出称量皿前盖好盖,放入干燥器内,冷却至室温,称量,精确至0.0002 g。
After 4h, close the vacuum pump (3.4), and let the air enter the drying box slowly through the drying system until the pressure of the drying box returns to normal pressure. Take out the weighing dish, cover it well, put it into the dryer, cool it to room temperature, weigh it to the nearest 0.0002g.
不要同时在干燥器内放置四个以上的称量皿。
Do not place more than four weighing dishes in the dryer at the same time.
应进行平行实验。
Parallel experiments shall be carried out.
注:如果在实验的过程中或实验后,原料的颜色明显变为黄色,应在相对较低的温度下重复实验,并在报告中说明。
Note: if the color of the raw material changes to yellow obviously during or after the experiment, the experiment shall be repeated at a relatively low temperature, which shall be described in the report.
关于无水葡萄糖http://www.jnjdbc.com就先介绍到这里了,相信大家在实际的工作中会用到相关知识,如果您有这方面的需要,欢迎前来选购。
About anhydrous glucose http://www.jnjdbc.com introduced here first, I believe you will use the relevant knowledge in the actual work, if you have this need, welcome to purchase.

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