Graywolf
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thanks for the help. we did test the material before we run it and got a clean result then re tested it after we processed it and was positive of pesticides. never happen before. thing the lab might have messed up.
One of the reasons we got a GC, was to protect ourselves and our equipment from pesticides on incoming material that isn't from our garden. If it is contaminated, it fouls not only the concentrate, but the recovered butane and internals of our systems, requiring a full dump and internal cleaning. It only took once for us to lose our sense of humor.
Your lab ostensibly screwed up, but you may have also concentrated it some with your extraction, sooo the truth may be in the middle. A recent Oregonian expose', revealed the presence of both pesticides and residual solvent in a high percent of the random concentrate samples they had tested, so it is a problem we're all stuck with, unless we only process our own material.
At what concentration levels are they showing up in the concentrate?