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c/coa·submitted 2 months ago by u/soren_zamora

help me understand water content, I have read the wiki twice

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help me understand water content, I have read the wiki twice. Searched first, found three threads that contradict each other, hence the post. Asked QSC 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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6 comments, started 2 months ago
u/nadia_kjaer18 points·2 months ago

The PDF creation date being later than the analysis date is usually a re-issue or a re-export. It is worth one question and it is not evidence of anything on its own.

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u/camila_lindqvist14 points·2 months ago

Batch number and date of analysis, are both on there?

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u/nadia_kjaer7 points·2 months ago

ask for the storage condition the stability statement was written against

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u/bastian_moreau3 points·2 months ago

water content is on there and everyone skips it

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u/wanjiru_varga15 points·2 months ago

chromatogram or it did not happen

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u/emil_agyeman13 points·2 months ago

Yes — and the reason to ask for the whole page is that the interesting parts are the ones people crop out to fit a screenshot.

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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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