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

why does nobody talk about certificate of analysis

Questionbranch of 7 comments

Trying to settle this properly because the thread from last year went in circles. The claim: certificate of analysis matters. The counter-claim: it is measurement error. Both sides have been asserting it confidently for about 13 months without either producing anything. What would actually settle it is 3 people…

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7 comments, started 11 months ago
u/rohan_steiner0 points·11 months ago

The confident tone is doing a lot of work that the evidence is not.

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u/mikkel_correia1 point·11 months ago

the counterion is part of the mass you paid for

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u/milos_trevino1 point·11 months ago

the counterion is part of the mass you paid for

Yes, exactly this, and it is the bit that took me 23 weeks to accept.

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u/cormac_pereiraOP1 point·11 months ago

redact your own name, not the vendor's batch details

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u/mikkel_correia1 point·11 months ago·edited

the batch number or it did not happen

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u/anya_correia1 point·11 months ago

the batch number or it did not happen

Counter-anecdote: opposite result, same dose. Which mostly tells us the variance is huge.

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u/amara_halonen1 point·11 months ago

axis labels included, always

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About c/coa

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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