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c/coa·submitted 2 years ago by u/ismael_eriksen

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

Discussionbranch of 6 comments

I have had 13 orders now and I keep a table, so here is the honest summary rather than a vibe. Material has been consistent. Communication has not. Shipping has varied by about 28 days on nominally the same lane, which matters more in summer than in February. The independent number came back 98.4% against a claimed…

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6 comments, started 2 years ago
u/nadia_fonseca86 points·2 years ago

What is the method line say? Not the technique, the actual method.

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u/coa_collectorarchivist0 points·2 years ago

PDF metadata is checkable in fifteen seconds

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u/freya_baptista1 point·2 years ago

PDF metadata is checkable in fifteen seconds

Adding to this: COA is doing more work than the comment implies.

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u/sig_figs_sammod · analytical1 point·2 years ago

the batch number or it did not happen

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[removed]35 points·2 years ago

[removed by moderator]

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u/ismael_eriksenOP16 points·2 years ago

Sent one vial to Janoshik and VendorInvestigate. 97.4% and 97.2%. Cost me more than the vial did and I would do it again.

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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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