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c/coa·posted 2 years ago by u/anya_correia

three years of area percent threads, summarised so you do not have to read them

COA Cold Box ×7 Clean Column ×2 Long Haul ×2

Quick one. Canada here.

water content works very differently where I live than in the threads that dominate the front page, and I keep seeing people confidently given advice that simply does not apply outside the US.

Specifics: the route I used took 19 weeks and cost roughly what I expected. The admin was worse than the cost. The thing that would have saved me the most time was knowing which document to ask for at the start.

Happy to answer questions from anyone in the same jurisdiction.

21,058 up / 15,715 down57% upvoted27 commentsid 1ikzg720 Jun 2024

27 comments

23 in this archive, depth 4

best — the order this archive was captured in

u/janek_ferrari971 points·2 years ago

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

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u/tidy_vialdrawer_watch779 points·2 years ago

the counterion is part of the mass you paid for

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u/ismael_eriksen631 points·2 years ago·edited

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

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u/receptor_bias_rick179 points·2 years ago

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

Disagree on that part. 95.1% and 97.6% on the same vial is normal.

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u/dario_boateng642 points·2 years ago
the VendorInvestigate number or it did not happen
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u/anya_correiaOP385 points·2 years ago

PDF metadata is checkable in fifteen seconds

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u/santiago_szabo379 points·2 years ago

Water content on the document? That affects your concentration math.

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u/anya_correia242 points·2 years ago

the batch number or it did not happen

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u/first_hundred143 points·2 years ago

the batch number or it did not happen

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

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u/teodor_jansen169 points·2 years ago

the batch number or it did not happen Adding to this: COA is doing more work than the comment implies.

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

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u/sunday_shot_sal174 points·2 years ago

the related substances line is where the story is

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u/priya_palacios557 points·2 years ago

Water content on the document?

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

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u/chidi_demir321 points·2 years ago

the related substances line is where the story is

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u/kavya_verhoeven88 points·2 years ago

PDF metadata is checkable in fifteen seconds

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u/tidy_vialdrawer_watch341 points·2 years ago

chromatogram or it did not happen

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u/nadia_kjaer96 points·2 years ago

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

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u/gastric_emptying_g-20 points·2 years ago

Cosigning. The batch number is load-bearing information.

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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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  1. Post the full document. Cropped COAs that hide the batch number or date get removed.
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