Dear list members,
When I ran pure deionized tap water (DITAP) and DITAP with enough NACl
to reach an ionic strength of 0.7 I got different D/H results on my
TC/EA, presumably due to a salt effect during pyrolysis. I had to
change out and clean the glassy carbon tube after running the salty
solns in order to get reasonable D/H values for DITAP again. Anybody
else notice similar or different effects?
Stable Isotope Lab
Savannah River Ecology Lab
>>> [log in to unmask] 12/08/04 07:19AM >>>
Dear List members.
I have been sending hyper saline water samples for deuterium and
analysis. The lab uses pyrolisis method (Finnigan Delta Plus XL ion
mass spectrometer and Thermochemical Conversion Elemental Analyzer
peripheral to analysis these samples. I have been using these results
correcting for the salt effect.
Lately, I was told that measurements are usually difficult in
sample because of the saturation of salts is attained and therefore
isotopic effects become more complex as the exchange rate between CO2
water slow down considerably.
I'm bit confused, can someone explain to me how the pyrolisis method
Thanks in advance for any help.