Hi all,

>                 I am looking for any references you can recommend that
> refer to method(s) for removing H2S from CO2 in an on-line cleanup scenario.
>                 One way that suggests itself to me is to pass the gas
> mixture over silver wool; reacting the H2S to Ag2S and forming hydrogen,
> the H2/CO2 mixture can then be cooled with LN2 to freeze out the CO2 for
> collection?

We've always used a cold finger with Silver Phosphate.  We freeze any gases
with suspected H2S contamination onto the finger, close it off and allow the
gas to warm up, wait a couple of minutes, then freeze the now clean CO2 into
the collection bottle for the mass spec.  It should be noted that Silver
Phosphate degenerates if left exposed to light, like a few other Silver
compounds.  We use a detachable finger with a Young's B14 cone on it, and
have an opaque sleeve which we slide over the finger when it's on the line
but not in use.  When it's off the line it's kept in a nice safe dark drawer
in the corner of the lab.

Hope this helps,

Andrew
--
email:  [log in to unmask]  Tel:  (01355) 223332  Fax:  (01355) 229898