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c/coa·submitted 1 year ago by u/neha_erdogan

[Discussion] the purity advice in here is 9 years out of date

Discussionbranch of 7 comments

Posting this because I searched for it and got nothing useful. Setup: 1.7mg, week 52, sulphur burps present but not ruining anything. I changed exactly one variable — COA — and tracked it for 9 weeks. Result: a difference, but a small one, and well inside what I would call noise if someone else posted it. So I am…

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7 comments, started 1 year ago
u/zeynep_zielinski21 points·1 year ago

The COA I was holding said 96.8% area and I thought it was trash. Turns out the method was solid and the impurity profile was clean.

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u/halima_boateng10 points·1 year ago

The COA I was holding said 96.8% area and I thought it was trash.

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

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u/rania_okonkwo6 points·1 year ago

Disagree but this is the good kind of wrong — it is specific enough to be checked.

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u/ahmed_rasmussen3 points·1 year ago

the related substances line is where the story is

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u/india_generic_g2 points·1 year ago

Cosigning. The batch number is load-bearing information.

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u/coa_collectorarchivist1 point·12 months ago

post the whole document, not the headline number

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u/laila_yilmaz12 points·1 year ago

The COA I was holding said 96.8% area and I thought it was trash.

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

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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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