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

anyone else notice area percent kicking in around week 25

Questionbranch of 7 comments

Trying to settle this properly because the thread from last year went in circles. The claim: COA matters. The counter-claim: it is measurement error. Both sides have been asserting it confidently for about 18 months without either producing anything. What would actually settle it is 19 people measuring the same thing…

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7 comments, started 1 year ago
u/mikkel_correia152 points·1 year ago

Yeah, 96.8% area is not the problem, the missing impurity breakdown is the problem.

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u/valeria_karlsen116 points·1 year ago

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

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u/reflux_report39 points·1 year ago·edited

the related substances line is where the story is

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u/tidy_vialdrawer_pls24 points·1 year ago

Disagree. What you are describing is consistent with related substances, not with what you concluded.

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u/foam_head_fred6 points·1 year ago

no "is this good?" without saying what the compound and claimed purity are

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u/amylin_amyamylin5 points·1 year ago·edited

Batch number and date of analysis? Both are load-bearing.

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u/coa_collectorMOD116 points·1 year ago

Tracking number removed. It identifies both ends of a shipment.

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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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