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