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

why does nobody talk about related substances

COAbranch of 9 comments

Right, the certificate of analysis question again, but with numbers this time. I have 9 data points over 14 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…

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9 comments, started 1 year ago
u/purity_pedantanalytical11 points·1 year ago

The evidence standard in c/vendorvetting gets called too strict about once a month, and every time, the thread ends with the complainant agreeing.

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u/bastian_aalto5 points·1 year ago

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

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u/sofia_ferreira1 point·1 year ago

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

Yes, exactly this, and it is the bit that took me 88 weeks to accept.

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u/milos_trevino-29 points·1 year ago

Cosigning. The batch number is load-bearing information.

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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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