This is what ThoughtElf had me looking at last night. Still working on it. I've been reading through their method and the documents and ended up busting out the old Quant book to brush up on my MS theory (it's one thing to use it regularly and understand it yourself...but something completely different to try and explain it and make any sense, lol).
At first glance, I can tell you that the first thumbnail you posted shows that chloroform WAS one of the compounds in the syringe (qualitative analysis...answers the "what is it?" question). I'm still reading through their stuff to find their quantitative result (the part that tells us "how much"). You'll notice that the ion fragments for the standard have a much higher intensity... but I'm not quite sure if this (alone) provides enough information to make a determination about concentration of chloroform in the syringe. Do you have a direct link to their GC (or LC, whatever they used) chromatographs and their standard curve?
To quantify, you typically inject known, increasing concentrations of a standard and then integrate to find the area under the peak for each standard at the retention time for the compound of interest. *You can do this because area is proportional to concentration*. The concentration is plotted against the area beneath each peak (should be a linear response) and then you find the equation for the best-fit line. A sample of unknown concentration can then be analyzed...and the concentration of chloroform in the unknown can be calculated by plugging the area beneath the peak into the equation and solving for the concentration. It's the whole y=mx+b thing.... the standard curve allows you to determine the slope (x) and y-intercept (b), so once you measure x of your unknown (the area) you can solve for y (concentration).
Hope this kind-of answers your question... I'll keep looking and try to tell you what you were really interested in knowing.
Just wanted to give ya some type of answer right now so you didn't think I'd bailed on ya!