Mass spectrometry (usually ICP-MS) is the standard for detecting heavy metals, and can find extremely trace amounts. A tandem chromatography + mass spec setup is good for detecting small organic compounds like carcinogens. Unfortunately, this stuff is expensive. Less sensitive methods like flame spectroscopy for metals and column chromatography + IR spectroscopy for organics may be more doable in a DIY setting.
Mike
On Saturday, August 29, 2015 at 9:22:09 AM UTC-4, Gordana Ostojic wrote:
-- Mike
On Saturday, August 29, 2015 at 9:22:09 AM UTC-4, Gordana Ostojic wrote:
I assume that Raman would be great if one is testing a bulk substitution like if milk is replaced with palm oil. What technique is good for traces? Like traces of heavy metals or small carcinogenic compounds in food?I didn't look closely but that DIY Raman looks like an overkill. Raman would be a fairly easy to make with nonmoving parts. You need a lens, grating, filter and CCD (ok if you don't have a ccd and have a single detector, then you need a motor) and laser of course. I would buy from ebay.
On Friday, August 28, 2015 at 8:30:55 PM UTC-5, Branko wrote:Philippo, you might want to check this MOOC course ,scheduled for October :
https://www.futurelearn.com/courses/food-fraud
thanx to all posting in this thread , and pity GMO took over .
Hopefully DIY & afforable non-labeling tech like Raman spectrometer is close :
https://hackaday.io/project/1279-ramanpi-raman- spectrometer
http://www.sciencemadness.org/talk/viewthread.php?tid=23422
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