Dear Manuela,
It is not clear for me if you need 18O-enriched sulphate, or any published
information on it (references to a paper). Providing that you need a sample of
that sulphate - it depends how much of that heavy sulphate do you need. At
first, if you need natural materials, I would check the so called " desert rose
". It should not be difficult for you - as you have nice collection at your
University. You can also precipitate yourself even heavier sulphate.
If you need references to a paper - you can contact to Prof.S.Halas
([log in to unmask]) - he has described sulphate with d34S of about +70
per mil - but I do not know about d18O value. If reduction process formed so
high d34S - the d18O value should be very high also.
Mariusz



Manuela Junghans wrote:

> Hello all,
>
>  I am looking for sulfates with a high delta 18O value, (around + 20
> promille)for experimental work. I couldn't find any in the literature, so I
> am not sure if there even exist such sulfates. I would appreciate any
> suggestions.
>
> I am also searching for literature on the use of isotopes in studies of mine
> water flow regimes (e.g. stratification of mine waters, convection of mine
> waters). I would be grateful for any references.
>
> Thanks.
>
> Manuela Junghans