the flat bottom are made from soda-lime glass, the round bottom from
(the more expensive) borosilicate glass.
This makes the round bottom more resistant for acid e.g. used in
carbonate or DIC analysis.
There was a paper about the influence of various glass types on the
oxygen and carbon isotopic composition. However, I am not sure if it
dealed with water or with carbonate samples (an I can't find the copy at
the moment... :-)).
Nelson, S.T., 2000, Sample vial influence on the accuracy and precision
of carbon and oxygen isotope analysis in continuous flow mass
spectrometric applications: Rapid Communications in Mass Spectrometry,
v. 14, p. 293-297.
From my personal experiences: Doesn't matter as long as you do not mix
On 23.06.2011 22:17, Dana Biasatti wrote:
> Can anyone tell me if there is an advantage in using the flat-bottomed
> exetainer vials rather than the round-bottom vials for running water
> samples on the gas bench?
Dr. Robert van Geldern
GeoZentrum Nordbayern / Applied Geosciences
University of Erlangen-Nuremberg
91054 Erlangen, Germany
mailto:[log in to unmask]
fon: +49(0)9131-85-24780 (office)
Room: O 0.106 (office)