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

what would you tell week-1 you about related substances

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Trying to settle this properly because the thread from last year went in circles. The claim: certificate of analysis matters. The counter-claim: it is measurement error. Both sides have been asserting it confidently for about 24 months without either producing anything. What would actually settle it is 21 people…

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4 comments, started 1 year ago
u/yara_antonsen652 points·1 year ago
more of this energy please
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u/anya_correia263 points·1 year ago

the related substances line is where the story is

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u/joaquin_ivaturi169 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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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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