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

three years of certificate of analysis threads, summarised so you do not have to read them

COAbranch of 5 comments

Right, the purity question again, but with numbers this time. I have 24 data points over 10 weeks. The pattern is consistent enough that I do not think it is chance, and boring enough that nobody is going to screenshot it, which is usually a good sign. The thing I would flag for anyone new: the effect I am describing…

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5 comments, started 1 year ago
u/milos_vanhecke355 points·1 year ago

PDF metadata is checkable in fifteen seconds

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u/milos_trevinoOP227 points·1 year ago

PDF metadata is checkable in fifteen seconds

Counter-anecdote: opposite result, same dose. Which mostly tells us the variance is huge.

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u/milos_trevinoOP160 points·1 year ago

area% is not mass%, and here is exactly why it matters

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u/milos_trevinoOP203 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/nikhil_lindqvist127 points·1 year ago

Strongly agree. Mass% and area% are answering different questions on the same document.

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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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