I suggest using silver filters.


At 08:17 AM 4/18/2007, you wrote:
>I'm going to be running an experiment soon with 18O labeled nitrate.
>I'd like to account for all possible pools of the label after the
>addition and right now the big question is what type of filter to use.
>I'll be analyzing the filters with TC/EA continuous flow mass spec @
>1450 C.  I'm worried that the O content in cellulose or nylon would
>drown out the signal (and I can't use the nylon filters because I'll
>also need to run them for 15N).  Does anyone on the list have
>experience with this?  Does anyone have any experience with glass
>microfiber filters and 18O?  I'm worried that at high temps there might
>be exchange between the silica and labeled O.  Thanks for any help and
>your expertise.
>
>Rich MacLean
>Grad Student
>UNH Dept. Natural Resources
>
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David Harris
UC Davis Stable Isotope Facility
Department of Plant Sciences
3112 Plant & Environmental Sciences Bldg.
Davis, CA 95616
http://stableisotopefacility.ucdavis.edu
phone 530 754 7517
fax 530 752 4361