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c/coa·submitted 19 days ago by u/aurel_boateng

PDF producer string says the file was made in a browser. is that normal

COAbranch of 9 comments

Right, the related substances question again, but with numbers this time. I have 19 data points over 10 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…

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9 comments, started 19 days ago
u/rania_okonkwo8 points·19 days ago

What were the related substances listed individually?

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u/gastric_emptying_g-14 points·19 days ago

chromatogram or it did not happen

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u/anya_correia1 point·19 days ago

chromatogram or it did not happen

Yes, exactly this, and it is the bit that took me 16 weeks to accept.

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u/janek_ferrari1 point·18 days ago

the method line is doing real work, not just window dressing

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u/alcohol_aversion1 point·18 days ago

Slight fix: the number was 98.7, not 96.8. Decimal point, but a fairly consequential one.

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u/nadia_kjaer1 point·18 days ago

Strongly agree. Mass% and area% are answering different questions on the same document.

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u/tove_ogunleye1 point·17 days ago

post the whole document, not the headline number

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[deleted]3 points·18 days ago

[deleted]

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u/dario_vermeulen1 point·18 days ago

the counterion is part of the mass you paid for

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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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