Hi, Alex:

Another easier way to get rid of H2S is to let the mixture of CO2 and H2S pass
through a Ag3PO4 trap at 150 degree C.

I also heard  that to allow the CO2+H2S react with Zn at 450 degree C for about 30
minutes before you heat the iron during graphitization. Any comments about that?

Regards.

Dachun Zhang

Carolyn Colonero wrote:

> Dear Graeme
>
> I think the plastic bottles are OK for the short time storage. we regular
> do 13C and 14C analyses and most samples come in plastic Nalgen bottles. I
> have some experience with brines, they are horrible.
> I found that the best way to clean that kind of samples from S compounds is
> purification of  CO2 after extraction from solution. I collected gas in the
> tube with Cu, CuO and Ag sealed them of and heated for 2-3 hours under t=525C.
> That method works fine and we did not have a problem with graphitization
> after this purification.
>
> Alex Cherkinsky
>
> Dr.Alexander Cherkinsky
> Geochron laboratories,
> Radiocarbon Lab Manager
> 711 Concord Ave.
> Cambridge, MA 02138, USA
> Phone: 617 876-3691
> Fax:   617 661-0148
> E-mail:[log in to unmask]
>
> At 10:57 AM 11/21/01 +1300, you wrote:
> Are plastic (PVC) bottles adequate for short term (days) storage of
> groundwaters
> before extraction of C for 13C and 14C analysis?
>
> What is the best way to treat for sulfur in the oilfield brines before
> extracting the CO2 ?
>
> Graeme Lyon
>
> Dr G L Lyon,
> Rafter Building,
> Institute of Geological & Nuclear Sciences Ltd,
> P O Box 31 312, [courier address: 30 Gracefield Road]
> Lower Hutt,
> New Zealand
> Phone: 64 + 4 + 570 4637
> Fax : 64 + 4 + 570 4657
> Email: [log in to unmask]
> Web : www.gns.cri.nz