By michelle on Thursday, July 17, 2003 - 12:59 am:
Hi,everybody,
any one can explaint the "moving-wire detector"?
I saw this word in this website. http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=649714&dopt=Abstract
thank you all.
By Anonymous on Thursday, July 17, 2003 - 02:54 am:
The moving wire detector was an ancient device in which the LC column effluent dripped on to a continuously rotating wire. The solvent was evaporated from the eluent by heaters. The wire then passed into a flame ionisation detector before being cleaned and passing under the LC column again to receive more effluent. The idea was to use the detector for compounds which gave no UV or VIS response. Sounds complicated? It was!
That's why most people gave up using it long ago. However, the idea re-appeared again in the moving belt detector used at the beginning of efforts to link LC and MS.
David McCalley
By bill on Thursday, July 17, 2003 - 07:49 pm:
Anyone who remembers the "moving wire detector" should be retired! Ha, Ha
By Anonymous on Friday, July 18, 2003 - 02:21 am:
Thanks Bill!
I guess you remembered it too!
David
By B.Buglio on Friday, July 18, 2003 - 08:41 am:
Bill-I worked w on it at Roche for quite awhile
and am also (happily) retired. The only thing Dave
has left out is that the analyte was converted to
methane before entering the FID.
By Anonymous on Sunday, July 20, 2003 - 06:27 pm:
I have played with these things, but retirement is only a wish for the far future....
By Jim on Monday, July 21, 2003 - 04:43 am:
not that they're used any more so the question is moot but:
B. Buglio: how does the analyte get converted to methane? I tried a quick google and didnt come up with anything. Is this specific for a certain class of analytes or is it a universal conversion to methane. Just seems like an odd contraption.
Thanx
Jim
By B.Buglio on Monday, July 21, 2003 - 11:28 am:
Jim- the spl, stripped of solvent, passed thru a
nickel catalyst in the presence of hydrogen and
was converted methane.