Michael

We routinely use quartz filter in our EA-Conflo-Delta system. It presents no
problem and minimal N blank.

Tim H.E. Heaton

NERC Isotope Geosciences Laboratory
British Geological Survey
Keyworth, Nottingham NG12 5GG, England
(www.bgs.ac.uk/nigl/index.htm)

Tel. +44(0)115 936 3401
Fax +44(0)115 936 3302
E-mail: [log in to unmask]


-----Original Message-----
From: Michael Dolan [mailto:[log in to unmask]]
Sent: Wednesday, March 31, 2004 10:55 PM
To: [log in to unmask]
Subject: [ISOGEOCHEM] Glass microfibers in EA?


Dear List -

Our laboratory has an EA (Carlo Erba NA1500) interfaced with an Optima
stable isotope ratio (continuous flow) mass spec.  A colleague has
requested analysis of 15N materials on quartz glass microfiber
filters.  The concentrations of 15N do not concern me, but I wonder if the
microfiber material may present a combustion problem.  Other problems?  Any
experience or thoughts on the matter would be appreciated - still fairly
new to the instrument!

Thanks, MD
-----------
Michael S. Dolan
Support Soil Scientist
USDA-ARS
439 Borlaug Hall, Univ. of Minnesota
1991 Upper Buford Circle
St. Paul, MN  USA  55108
Phone: (612) 625-9245   FAX: (651) 649-5175


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