Hi Dachun,


What is your head-space sample / reservoir volume and how much do you
withdraw? What exactly do you mean by saying "continuously sampled"?
Several sub-samplings, i.e. multiple withdrawals of head-space aliquots?
If so, what's the volume of such a sub-sample?


Cheers,

Wolfram



> -----Original Message-----
> From: Stable Isotope Geochemistry
> [mailto:[log in to unmask]] On Behalf Of Dachun Zhang
> Sent: 21 October 2004 19:51
> To: [log in to unmask]
> Subject: dissolved CO2
>
>
> Hi,
>
> How much differences are the d18O  of  head space CO2 and the
> CO2 dissolved in water (40 oC)? I found d18O is inreasingly
> heavier when the CO2 is continusly sampled out from the head
> space and measuered for isotopic composition.
>
> Regards.
>
> Dachun Zhang
> Zymax
>