We add a small amount of copper to a vial with sample, seal it, and leave
it for about a week.
We then add the catalyst.
This works great.
> Dear ISOGEOCHEMers,
> We are currently receiving more and more water samples that contain
> either sulfide and/or organics for D and O-18 analysis because of an
> increased focus on groundwater/surface water interaction studies. This
> tends to cause problems when analysing for D using H2 equilibration
> because of poisoning of the Pt catalyst and also when using our LGR.
> Does anyone have suggestions as to how to treat the samples before
> analysis. I am assuming that we may be able to preciptate the S using
> either Zinc Acetate or silver wire but would appreciate advice from
> anyone who has had success with similar problem samples.
> Thanks again,
> Fred Leaney
> CSIRO Isotope Analysis Lab, Adelaide, Australia