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c/coa·posted 1 year ago by u/dario_boateng

[PSA] COA is not what most of this community thinks it is

Suspicious Clean Column ×2 Receipts ×1 Slow Clap ×3

Quick one. Canada here.

batch 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 21 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.

3,721 up / 365 down91% upvoted40 commentsid 1uicnl18 Jul 2025

40 comments

16 in this archive, depth 4

best — the order this archive was captured in

u/valeria_girard502 points·1 year ago

Sceptical. If this were true we would see it reflected in the data and we do not.

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u/dario_boatengOP203 points·1 year ago

PDF metadata is checkable in fifteen seconds

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u/meera_sandvik293 points·1 year ago

Edit to your parent would help — the concentration you quoted assumes one scenario and you have written another above it.

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u/bastian_aalto166 points·1 year ago

the related substances line is where the story is

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u/sunday_shot_sal53 points·1 year ago

This is the "correlation is mechanism" thing again. You changed three variables at once.

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u/sunday_shot_sal425 points·1 year ago

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

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u/sunday_shot_sal123 points·1 year ago

What were the related substances listed individually?

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u/soren_nkemelu338 points·1 year ago

What were the related substances listed individually?

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u/vito_chowdhury108 points·1 year ago

purity and net content are two different numbers, same vial

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u/emeka_chowdhury0 points·1 year ago

Inter-lab variance on this kind of assay is routinely 1–2 points. Different column, different gradient, different integration.

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u/clara_restrepo1 point·1 year ago

post the whole document, not the headline number

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u/laila_yilmaz201 points·1 year ago

post the whole document, not the headline number

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u/rohan_steiner48 points·1 year ago

post the whole document, not the headline number

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

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u/karma_irrelevant0 points·1 year ago

Inter-lab variance on this kind of assay is routinely 1–2 points. Different column, different gradient, different integration.

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u/zeynep_zielinski1 point·1 year ago

What were the related substances listed individually?

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u/emeka_beaulieu1 point·1 year ago

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

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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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