method development — 14 things I got wrong before I got it right
method development — 14 things I got wrong before I got it right. Not a hot take, just something I have not seen said plainly here. Chased a ghost peak for three weeks. It was the plumbing. It is always the plumbing. A shoulder that does not baseline-resolve cannot be quantified honestly. You can report it as an…
Retention time shifted 0.4 minutes and I assumed the worst. It was the column temperature.
Trace posted without axis labels — asked for a relabelled version rather than removing it.
System suitability — repeat injections, tailing factor, plate count, RSD on area — is what tells you the instrument was fit for the measurement that day. Without it, the purity figure is unanchored.
Can you post the trace with the axes labelled?
Cosigning the wavelength point. Half the disagreements in this board are two people looking at different detectors.
Right. And a blank between injections settles the carryover argument before it starts.
system suitability before you believe any number on the run
Right.
Agreed. And the corollary is that the method line on a certificate is not decoration, it is the number’s provenance.