>Dear all,
>
>In adittion to Tullis question, can anyone suggest methods to improve
>sensitivity (reduced sample amount demands) on my GCCIRMS compared to
>the "standard performance"? I have a Delta plus connected to a GCC.
>
>               Lars Löfgren
Dear Lars,
first you may try to concentrate your sample in a V glass vial, then dilute
it in a minimum of solvent (30ul). Second, purification of the sample e.g.
by TLC could reduce the noise thus improving signal/noise ratios. Third,
you may try to increase the GC resolution (lower temperature rate, longer
column, optimizing He flow, thinner phase thickness, ultrastable 100%
methylsiloxane phase, true on column injector...) again to reduce noise
level.

Good luck,
Eric LICHTFOUSE
Laboratoire Sols et Environnement
INRA-ENSAIA/INPL, BP 172
2, avenue de la foret de Haye
F-54505 Vandoeuvre-les-Nancy Cedex, France
Phone (33) 3 83 59 58 99 (-58 45, -58 65)
Fax (33) 3 83 59 57 91
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