Keith,

To the best of my knowledge, the method most commonly used is (and the
only one I've used) is to run the H2S over Ag3PO4. Charef and Sheppard
(1984) Isotope Geoscience 2:325-333, mention this. In my experience, it
is absolutely effective. You can buy Ag3PO4, but it is also really easy to
make from water-soluble KH2PO4 and a buffered AgNO3 solution. The nice
thing about making it this way is that you can evaporate to dryness, add
water again (to redissolve the nitrate species present and then just
filter.  It's very quick (only a few hours) and easy.

Lois J. Roe
University of California
ESPM/Division of Ecosystem Sciences
151 Hilgard Hall
Berkeley, CA 94720
Office: (510) 643-6910
Fax:    (510) 643-5098
E-mail: [log in to unmask]


On Thu, 6 May 1999, Keith Harris wrote:

> Dear Listmembers,
>                 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?
>                 Thanks in advance for any help.
>                                          Keith Harris
>