Hello everyone!

        I'm a graduate student at the University of Virginia beginning a
project on Oxygen-18 and deuterium in rain water.  I'm building a rain
collector that allows for collection at 5 minute increments for 12
hours and I am worried about the possibility of sample fractionation. I
read a paper suggesting the creation of a dodecane bi-layer when analyzing
for oxygen, but I am unsure how this would effect deuterium results.
Does anyone know of a reference or have an opinion of using such a
technique when analyzing for deuterium?  Due to field constraints,
refrigeration really isn't an option and I was curious if anyone
had ever run into this problem before or had a good solution to
fractionation in the field.

        Thanks!,
                Isabella Angelini
                University of Virginia
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