t****0 发帖数: 33 | 1 有个可能比较囧的问题请教各位牛人。我在称量碳酸钡(BaCO3)粉末的时候(from Alfa
Aesar purity>99.95%),发现scale上显示的质量一直会变。。大概1分钟会少个1微
克(总量大概5g),称量其他粉末时不会有这种情况。每次都要等45分钟左右质量才会
稳定下来,不知道这是什么原因啊?环境就是室温的普通实验室,scale大概有5位小数
吧。我做过TGA,含水量也不过0.5%,可是不至于室温下会脱水吧。。。很无奈的问题
,还请各位赐教 |
s**********8 发帖数: 25265 | 2 5g 少 45ug why would u care? |
B******1 发帖数: 9094 | 3 I think the Moon is coming closer to the Earth when LZ was measuring the
sample. Thus the gravity field felt by the sample was changing by the
seconds. Another reason could be there was a huge, invisible giant walking
acound the lab and caused the disturbance. LZ should design an accurate
experiment to prove or disprove the above hypotheses and ask his or her
child to carry out said experiment for a chance to win the Intel Award . . . |
t****0 发帖数: 33 | 4 不好意思 改过来了 是一毫克
Alfa
【在 t****0 的大作中提到】![](/moin_static193/solenoid/img/up.png) : 有个可能比较囧的问题请教各位牛人。我在称量碳酸钡(BaCO3)粉末的时候(from Alfa : Aesar purity>99.95%),发现scale上显示的质量一直会变。。大概1分钟会少个1微 : 克(总量大概5g),称量其他粉末时不会有这种情况。每次都要等45分钟左右质量才会 : 稳定下来,不知道这是什么原因啊?环境就是室温的普通实验室,scale大概有5位小数 : 吧。我做过TGA,含水量也不过0.5%,可是不至于室温下会脱水吧。。。很无奈的问题 : ,还请各位赐教
|
Y****r 发帖数: 3473 | 5 might be static from your weighing paper, use aluminum foil instead |