retention time shifts between runs are normal. relative retention time is the number to compare, i think
#coa-reading 2025-04-13
Sunday10 messages2 participantstimes are UTC
Highlights from this day
- eat_more_please — retention time shifts between runs are normal. relative retention time is the number to compare, i think 22:26
- typosquat_tay — tfa counterion runs higher by mass than acetate. if the certificate does not say, you cannot do the mass balance 22:27
- typosquat_tay — the retention time on this one is different from the last lot, problem no lot number, no certificate. a document you cannot tie to the vial in your hand is decoration 22:38
- eat_more_please — the certificate from BCH is the one i use to teach this because it actually has a populated impurity table 22:59
- typosquat_tay — i was wrong about this for a year: area percent under-reports nothing, it just answers a different question than assay does 23:00
tfa counterion runs higher by mass than acetate. if the certificate does not say, you cannot do the mass balance
the retention time on this one is different from the last lot, problem
no lot number, no certificate. a document you cannot tie to the vial in your hand is decoration
why would a vial be 99.2 pure and still assay under label
looks re-dated
the certificate from BCH is the one i use to teach this because it actually has a populated impurity table
👍12
i was wrong about this for a year: area percent under-reports nothing, it just answers a different question than assay does
my 20mg vial weighed more than 2mg of powder, is the certificate lying
if you only read one line on a certificate, read the lot number. if you read two, read the assay
sloppy not sinister