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c/coa·submitted 8 months ago by u/tuva_aalto

genuine question about COA that I am slightly embarrassed to ask

Explainerbranch of 6 comments

genuine question about COA that I am slightly embarrassed to ask. I am not trying to be the "source?" guy. I would just like a source. The four things a certificate must carry, and what each one is for. Batch identifier ties the document to your vial; without it the document is about somebody else’s material. Date of…

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6 comments, started 8 months ago
u/nadia_fonseca-26 points·8 months ago

the counterion is part of the mass you paid for

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u/low_appetite_lisa0 points·8 months ago

the counterion is part of the mass you paid for

nadia_fonseca has the distinction right — one is a fraction of the detector signal, the other is a fraction of the mass.

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u/hassan_chowdhury1 point·8 months ago

Yes. The structure of the document matters at least as much as the number printed on it.

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u/zeynep_zielinski1 point·8 months ago

What does the method line actually say? Not the technique — the column and the gradient.

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u/aleksi_eriksen1 point·8 months ago

Asked GL Biochem for the batch-specific certificate and had the full document — batch, date, method line naming the column — inside six hours. That is now my baseline for everybody.

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u/soren_nkemelu1 point·8 months ago

Pushing back a little: a missing field is usually presentation, not concealment. Ask for the full document before drawing conclusions.

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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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