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c/coa·submitted 11 months ago by u/purity_pedant

[Question] how do you actually verify area percent

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Right, the COA question again, but with numbers this time. I have 5 data points over 26 weeks. The pattern is consistent enough that I do not think it is chance, and boring enough that nobody is going to screenshot it, which is usually a good sign. The thing I would flag for anyone new: the effect I am describing…

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4 comments, started 11 months ago
u/coa_collectorMOD320 points·11 months ago

This is an urgent-care question wearing a forum question's clothes. Please contact a clinician rather than waiting for replies.

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u/vito_chowdhury71 points·11 months ago

I am going to push back on this slightly.

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u/milos_trevino248 points·11 months ago

Did they give you the chromatogram or just the summary line?

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[deleted]102 points·11 months ago

[deleted]

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How to read a certificate of analysis and what it does and does not tell you. Area% versus mass%, identity versus quantity, water content, related substances, acetate counterions, and the difference between a vendor-supplied COA and an independent test on the vial you actually received.

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