Originally Posted by jakio
I think you're right that cross-contamination is the bigger risk. Truthfully, I suspect that at milligram doses of a 98% or 99% pure product, most of the likely common pesticide contaminants wouldn't have an acute effect and might not even be that harmful, but it would be interesting to do a survey to confirm that.
I'm looking to get GCMS done, right? That should be able to identify each contaminate by weight, I think. I'll have to do some more reading.
I've taken DNP before and felt fine on an acute basis, but who knows what kind of increased cancer risk or chronic toxicity might be present.
I'd be happiest with a non-profit group buy of very well tested bulk powder to spread the cost of GCMS around, but I don't think this is the forum for that. If I end up spending the cash, I'll definitely share the results.
I don't think labs you don't have some prior relationship with will readily do mass spec for you, least of all on industrial powders you have no license for that have been known to have a black market use. But that's just a guess. As I understand it with GCMS they would give purity of the desired compound, but no knowledge of anything you don't specifically request.
Zhengshou Nongda (Ms. Cindy Li above) claimed to use high-performance liquid chromatography.
It's also important to remember if the tests were true, 98% purity doesn't mean 2% evil. If the impurity isn't an (unintentional or intentional) cut with something else, it could just mean super high but not perfect yield. I don't know the manufacture process of DNP but to quote somewhere else:
After synthesizing a specific chemical, varying amounts of by-products, leftover catalysts, unused reagents, and potentially solvents remain. These can make up a significant portion of the immediately post-synthesis product. To create a pure product these adulterants must be removed. Creating a highly pure product (>98%) generally takes multiple passes. The desired product is iteratively isolated and, with each pass, purity is increased.
which would be far more desirable than cross contaminants, other pesticides, heavy metals.