By steven on Tuesday, January 21, 2003 - 07:29 pm:
Hi,
Hi,
I am still confuse which is the suitable filter membran for different mobile phases.e.g. regenerated cellulose, membran teflon or nylon. Is there any rules of thumb to use suitable filter?/ Any advice is very much appreciated. Thank you very much in advance.
regards,
Steven
By bill tindall on Tuesday, January 21, 2003 - 07:47 pm:
vendors and vendor catalogs have useful information on this topic
By Martin on Tuesday, January 21, 2003 - 10:42 pm:
Yes, have a look at the Millipore Laboratory Catalogue. There is a good overview on the chemical compatibility of the housing and filter materials (page 5 - 10).
By Anonymous on Wednesday, January 22, 2003 - 08:08 am:
We use PTFE for organic and organic-water mobile phases and nylon for aqueous mobile phases. Those two choices seem to work fine for us.
By Einar Pontén - SeQuant AB on Wednesday, January 22, 2003 - 03:01 pm:
PVDF filters are generally a good choice. For aqueous solution there are PVDF filters that have been made hydrophilic. It is advisable to wash and wet these with some solvent before use.
By Anonymous on Wednesday, January 22, 2003 - 07:23 pm:
Don't use HT-450 filters for mobile phases with THF, Filter is going to dissolve in THF
By Einar Pontén - SeQuant AB on Thursday, January 23, 2003 - 12:20 am:
Ion Chromatography require some extra care. Most filters are optimised for reversed phase where the content of ions is almost without importance. In IC both the mobile phase and samples may be contamined by filters, giving raise to high background conductivity or unexpected peaks.
By steven on Thursday, January 23, 2003 - 04:54 am:
Hi All,
Now, i have a bette idea about membrane filters Thank you very much for all the assistance.
Regards,
Steven