USPChangesAddressChallenging
Separations
USPmade changes in 1997 to overcome the
difficulties resulting fromunregulated
solvents coelutingwith regulated solvents and
thereby causing over-representationof their
concentration. These changes allowFID
methods, GC/MS or a second validated
column tobe used. Restek is currently
developing a new stationaryphase, which is
designed tobe a confirmation column to
phases such asG43&G27.
