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Single comment threadYou are looking at one branch of three years of area percent threads, summarised so you do not have to read them — 27 comments in the full submission. View in context.
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c/coa·submitted 2 years ago by u/anya_correia

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

COAbranch of 10 comments

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…

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10 comments, started 2 years ago
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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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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