Dear Mahendra,

I am very interested by this kind of subject and I would like to receive a
copy of your work, (in electronic form , if possible).

I thank you ,


Nelly Assayag


----- Original Message -----
From: "Mahendra P. Verma" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, October 08, 2004 10:26 PM
Subject: Re: [ISOGEOCHEM] equilibration time of CO2-H2O


> Hi:
>
>
>
> Recently, we did some work to understand the salt effect on the CO2-H2O
> isotopic exchange equilibrium. It will be published in the Proceedings of
> "Symposium on Quality Assurance for Analytical Methods in Isotope
> Hydrology"
> , IAEA, Vienna. The equilibrium also depends on other parameters, such as
> alkalinity, buffering capacity, pH, and amount of total dissolved CO2,
> etc.,
> which are still to be studied. If anyone is interested, I can send a copy.
>
>
>
> It looks with the discussion that one can reduce the analysis time with
> equilibrating CO2-H2O at higher temperature (say 40ºC). If it is really
> the
> objective, the answer is NO.  There will be other problems like water
> vapor.
> There will be substantial amount water vapor that will affect the oxygen
> isotopic analysis even one condenses the water vapor before injecting the
> CO2 into the mass spectrometer. CO2 is highly soluble in water. So, the
> condensed vapor will have some CO2 that will affect the isotopic
> composition
> of the equilibrated CO2. Although such experiments must always be
> encouraged, one gets sometimes valuable information with doing work
> against
> the normal procedures.
>
>
>
> I hope it should be of some contribution to the discussion.
>
>
>
> Cheers
>
>
>
> Mahendra
>