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c/coa·submitted 1 year ago by u/sig_figs_sam

why does nobody talk about related substances

COAbranch of 4 comments

Right, the certificate of analysis question again, but with numbers this time. I have 9 data points over 14 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…

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4 comments, started 1 year ago
u/purity_pedantMOD15 points·1 year ago

Tracking number removed. It identifies both ends of a shipment.

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u/marisol_frisk4 points·1 year ago

Yeah, 96.8% area is not the problem, the missing impurity breakdown is the problem.

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u/liv_nkemelu1 point·1 year ago

Yeah, 96.8% area is not the problem, the missing impurity breakdown is the problem.

Disagree on that part. 93.7% and 99.3% on the same vial is normal.

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u/cato_achebe5 points·1 year ago

Metadata check caught a COA that was created in a browser four months after the analysis date. Not evidence of fraud, but worth flagging to QYB.

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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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