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- Posts: 26
- Joined: Wed Jun 05, 2019 3:57 pm
Looking for a little help with this as it's not something I've come across before.
A certified reference standard we use for one of our methods is being discontinued. The supplier provides a CoA with this and the concentration is meant to be 100ug/ml. The CoA states an absolute value e.g. 99.5ug/ml or 100.3ug/ml etc. This allows us to do a correction factor for our standard and calibration points after analysis.
The replacement part number comes with a CoA that just says 100 +/- 6.6 ug/ml. There is no absolute value given.
Does anybody have experience with dealing with such a CoA?
Thanks.