In conversation with Lee Portnoff today, he mentioned two potential ways to sense for metal halides (interested in this because of copper/iron issues in Houston) with the air column monitor:
xray fluorescence (XRF)- take an xray of the source (on particulate or medium) and get a spectrum of the results. More info: http://serc.carleton.edu/research_education/geochemsheets/techniques/XRF.html
Inductively coupled plasma mass spectrometry (ICP-MS)- analytical method, collect on a filter and then dissolve More info: http://minerals.cr.usgs.gov/icpms/intro.html
Some potentially useful resources here for air sensing: http://www.drumair.com/index.php/bibliography
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