For anyone who wants to take a look... on the following link at page 11578 (handwritten at bottom right) you can see that they analyzed Q238.1 with GC-MS. They used selective ion monitoring to look for ions of mass-to-charge ratios of 47, 83, and 85... which are the highest intensity peaks you'd expect to see when chloroform fragments...thats what the top three chromatographs show. Also, note that the chromatograph shows that chloroform eluted from the column at nearly the same retention time (about 5.04 min) regardless of which ion they selectively monitored for.
The fourth chart is the mass spectrum for the compound that eluted at that particular retention time. This IS the mass spectrum for chloroform. This is how it's proven that (whatever sample Q238.1 is) chloroform was present in the sample that they analyzed. I can explain what the mass-to-charge ratios mean, also if anyone is interested but it isn't crucial to understanding the data we're discussing.
Same applies for sample Q240.1 (again, don't have a list, so I'm not sure what it is) on page 11598.
I also forgot to post the link...oops.
http://http://www.cfnews13.com/uploadedFiles/11571-11670.pdf