[Lab] split one vial across Janoshik and Medutest — 98.7% and 98.3%
Short version of the title, which is already short: split one vial across Janoshik and Medutest — 98.7% and 98.3%. Longer version underneath. Since the title puts numbers in the shop window: 98.7% and 98.3%. Bought a second-hand instrument and learned more in six months of fixing it than in three years of reading…
Agreed, and it is why QYB printing the column and gradient on the certificate is genuinely useful rather than decorative.
axis labels or the trace is decoration
Careful — you are treating retention time as identity. Two things can co-elute and the trace will not tell you.
Careful — you are treating retention time as identity.
Disagreeing with this bit: that spread is ordinary inter-lab variance, not a disagreement about the material.
a blank injection between samples costs four minutes and settles most arguments
That is area percent, not mass percent. The trace cannot give you the second one.
Right. And a blank between injections settles the carryover argument before it starts.
Push back: a longer run is not automatically better resolution. You are trading peak width for time and the ratio is what matters.