Monkey, suggestion...
Take a look at a source of scientific articles, track down a paper or two, and find the authors. Search the web for the authors, to find an email address. If they're with an organization like a university or even a company, you should be able to contact them. Then ya can ask if they know of any such research...
I did a search on volcanic emissions here and there are a lot of papers...
http://www.mendeley.com/research-papers/search/?query=volcanic+emissions
Some hits
Volcanic emissions of Se, Te and As from Kilauea Volcano, Hawaii
by L P Greenland, P Aruscavage
http://www.mendeley.com/research/volcanic-emissions-se-te-kilauea-volcano-hawaii/
Atmospheric and environmental impacts of volcanic particle emissions
by Adam Durant, Costanza Bonadonna, Claire Horwell
http://www.mendeley.com/research/atmospheric-environmental-impacts-volcanic-particle-emissions/
Radiative transfer corrections for accurate spectroscopic measurements of volcanic gas emissions
by Christoph Kern, Tim Deutschmann, Leif Vogel, Markus Wöhrbach, Thomas Wagner, Ulrich Platt
http://www.mendeley.com/research/radiative-transfer-corrections-accurate-spectroscopic-measurements-volcanic-gas-emissions/
Volcanism and the atmosphere: the potential role of the atmosphere in unlocking the reactivity of volcanic emissions
by Tamsin A Mather
http://www.mendeley.com/research/volcanism-and-the-atmosphere-the-potential-role-of-the-atmosphere-in-unlocking-the-reactivity-of-volcanic-emissions/
p.s. on the right it says "Related full-text papers for free"
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