I have tried to analyse it a few months ago. It is as Anthony mentionned very toxic. The problems are threefold:
1) The concentration has to be relatively high, from a toxicity point of view. Solution has to be in ppm to get ppb amounts in one microlitre GC injection. This alone makes the analysis dangerous.
2) MeHg has a low boling point making the compound come out very close to the different solvents we tried. On a Hg analyser this is not a problem since the detectors are oblivious to the solvent, not so here.
3) The Hg has to go somewhere after combustion. I had setup a gold wire trap post combustion to collect the Hg. It seemed to work and did not interfere with other analysis (so far) but the risks outweighed the analytical need.
-------- Message d'origine--------
De: Stable Isotope Geochemistry de la part de Linda Godfrey
Date: mar. 2005-09-20 16:26
À: [log in to unmask]
Objet: [ISOGEOCHEM] methyl mercury C-13
I have been asked about the possibility of analysing the carbon isotope
composition of the carbon's in methyl mercury (not the mercury). I have not
come across anything yet in the literature and was wondering if anyone has
experience of this or has also looked into doing something like this. I am
not sure whether a Dumas combustion is the way to go - would the compound
dissociate and "burn" and would the Hg be reduced to its elemental state
where the vapours might be picked up with a gold trap? It would be neat to
be able to inject it into an EA (with gold trap in line) if it does
combust, but I have no idea whether this is even remotely possible (and I
don't really want to 'try and see').
thankyou in advance for any advice,
Institute Marine and Coastal Sciences
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