Hi Glen
A while ago we used Dräger tubes (used to detect concentration of various gases in industrie) connected in line with adapters (Swagelok) to filter the H2S produced from certain CO2 carbonate acide reactions.  The idea came from Rick Heemskerk at the U of Waterloo during a lunch discussion at a restaurant (where all good ideas are often hatched).  It worked for us.  However keep in mind that this was under vacuum conditions at the time.  I am not certain what the Dräger tubes packing is (maybe lead acetate), but the principal reaction is:

H2S + Pb(2+)=> PbS + 2H+

Regards
Gilles

Gilles St-Jean
Chercheur / Research Scientist
U d'Ottawa/ U of Ottawa
Sciences de la Terre / Earth Sciences
Labaroires d'isotopes- G.G. Hatch -Isotope Laboratories
Ottawa, Ontario, Canada, K1N 6N5
Tel: (613) 562-5800 xt 6830 (bureau/office)
                    xt 6836 (lab)
Téléc./ Fax: (613)562-5192
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Toile / Web: www.isotopes.science.uottawa.ca

> -----Message d'origine-----
> De : Stable Isotope Geochemistry
> [mailto:[log in to unmask]] De la part de Glen E Martin
> Envoyé : 28 avril 2004 10:51
> À : [log in to unmask]
> Objet : Re: [ISOGEOCHEM] Suitable trap for H2S
>
> Rajesh,
>
> Try silver wool heated to several hundred degrees C. It
> worked fine for an off-line prep system here.
>
> Glen
>
>
>
>
>                       Rajesh Agnihotri
>                       <[log in to unmask]        To:
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>                       O.IN>                    cc:
>                       Sent by: Stable          Subject:
> Suitable trap for H2S
>                       Isotope
>                       Geochemistry
>                       <[log in to unmask]
>                       UVM.EDU>
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>
>                       04/28/04 07:04 AM
>                       Please respond to
>                       Stable Isotope
>                       Geochemistry
>
>
>
>
>
>
> Dear all
>
> Could anyone suggest a suitable chemical for trapping H2S
> (which might be present in anoxic sea /lake waters) but not
> affecting trace gases like CO and H2 (as these are species to
> be measured from anoxic waters) .
>
> Thanks
> Rajesh
>
>
>
> Rajesh Agnihotri Ph.D.
> Biogeochemistry Department
> Max Planck Institute for Chemistry P.O. Box 3060 55020 Mainz Germany
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