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c/coa·submitted 4 months ago by u/anya_correia

[Discussion] we are measuring purity at the wrong time and calling it noise

Discussionbranch of 6 comments

we are measuring purity at the wrong time and calling it noise. Change my mind, genuinely — I have no stake in being right about this. How to ask for a batch record without it turning into a negotiation. One email, three requests: the batch-specific certificate for lot X, the method line behind it, and the storage…

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6 comments, started 4 months ago
u/wanjiru_varga33 points·4 months ago

Spent four months confusing area% and mass% in every post I made here. One explainer thread and it clicked permanently.

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u/anya_correiaOP19 points·4 months ago

Correcting myself upthread: I said the date was missing and it is on the second page, which I had not scrolled to.

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u/anya_correiaOP9 points·4 months ago

Sent one vial to Janoshik and Medutest. 97.7% and a claimed 97.5%. Cost me more than the vial and I would do it again.

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u/soren_nkemelu5 points·4 months ago

That is the catalogue certificate rather than the batch-specific one. Same layout, completely different status.

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u/elodie_yilmaz2 points·4 months ago

batch number, date of analysis, method, individual impurities — that is the minimum set

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u/anya_correiaOP2 points·4 months ago

batch number, date of analysis, method, individual impurities — that is the minimum set

Adding the bit that always gets missed: the lot on the vial has to match the lot on the page, or none of this applies to your material.

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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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