By Anonymous on Wednesday, August 20, 2003 - 11:08 am:
Hi everyone
I'm not sure if this is the right forum to post my question. I have a suspension that has a lot of air bubbles..therefore determining the mass/ml is a bit difficult. The sample was allowed to stand for 24hrs without shaking but the air bubbles were still present. I need the mass/ml to determine my active content as mg/10ml in the suspension. Any suggestions would be appreciated.
Many Thanks.
By Anonymous on Wednesday, August 20, 2003 - 11:52 am:
Sonicate it
By Anonymous on Wednesday, August 20, 2003 - 11:00 pm:
I tried that with, little success.
By Anonymous on Thursday, August 21, 2003 - 12:35 am:
Vacuum
By readski on Thursday, August 21, 2003 - 04:19 am:
Try drawing it into a syringe and then weighing what you withdraw (carefully eliminating bubbles).
By Anonymous on Thursday, August 21, 2003 - 06:17 am:
Centrifuge
By bill tindall on Thursday, August 21, 2003 - 06:33 pm:
This is one of those (few) cases where using an internal standard makes sense. Draw a sample of the foamy stuff, add internal standard and analyze. the dilution of internal standard will tell you liquid volumn in the sample you took.
By Anonymous on Friday, August 22, 2003 - 03:54 am:
Thnaks for all athe advice. I tried centrifuging the suspension and this seemed to give the best result(i.e able to get a result without air bubbles using Anton Paar densimeter). I also had to set a "suitable" centifuging time/speed for the suspension. At high speed the suspension settled out which gave lower results.
Thanks once again for the advice.