Torsten,
not really for DIC but for sulfate sampling in groundwater we use zinc
acetate (a large pinch) + 2 ml CHCl3 (chloroforme) for poisoning
Gerhard
***************************



>Dear Isogeochemists
>
>We are interested in analyzing DIC from groundwaters by acidification with
>H3PO4. The water samples are commonly poisoned with HgCl2 for this method.
>Would anyone know if  there is an alternative to the HgCl2?
>
>Thanks in advance, greetings
>
>Torsten.
>
>------------------------------------
>Torsten W. Vennemann
>Institute for Geochemistry
>University of Tuebingen
>Wilhelmstr. 56
>72074 Tuebingen
>Germany
>
>Tel: (0)7071 29 74992
>Fax: (0)7071 29 6870
>----------------------------------
>
>
Gerhard Strauch
Centre for Environmental Research Leipzig-Halle Ltd
Department of Hydrogeology
Hallesche Strasse 44
D-06246 Bad Lauchstaedt
Germany
Tel: ++49/34635/73218  Fax: ++49/34635/73287
e-mail: [log in to unmask]