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THC and carboxy-THC in Urine

Discussions about GC and other "gas phase" separation techniques.

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THC and carboxy-THC in Urine

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frage
We would like to ask if for the analysis of THC and carboxy-THC in Urine known internal standards differ from d3-THC carboxy-Δ9-THC, because they are hard to find on the market.
Thank you!

:lol:

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che313
i didn't remember were i read that they use ketaprofen as IS for thc-cooh.

by the way, which gc column you are using and at which conditions you are separating thc-cooh?
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