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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 8 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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8 comments, started 2 years ago
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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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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