Hi everyone,

We are working on a project about dissolved sulfide in
groundwater. I read some papers and it seems the
better way to precipitate sulfide in the field is to
use cadmium acetate. 

I checked the original paper by Van Everdingen et al
(1982) and the chapter by Mayer and Krouse (2006)in
Handbook of stable isotope analyitcal techniques. 
They all said that the PH values of water samples
should be adjusted to strongly basic conditions using
chemical like sodium hydroxide.  We did some test but
found that soon sodium hydroxide is added into cadmium
acetate solution, the white milk color material begins
to precipitate (we pre-fill the sample bottles with
cadmium acetate and sodium hydroxide). We'd like to
know what the white milk color materials are and
whether they will have any impact on the sulfide
precipitation that follows and thus the final isotope
analysis.

Thanks in advance,

River He


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