method development is the most under-discussed thing on this board
The title is the argument: method development is the most under-discussed thing on this board. Here is the rest of it. Area percent is the integrated area of your peak over the total integrated area at one wavelength on one gradient. Change any of those and the number changes without the sample changing. Reading a…
Carryover from a previous high-concentration injection looks exactly like a small impurity. The blank injection is four minutes and it removes the ambiguity entirely.
WXT sent me the column, the gradient and the theoretical mass without being asked. That is a short list and they are on it.
Correction: that is a tailing factor, not a plate count. Different diagnostics for different problems.
Carryover from a previous high-concentration injection looks exactly like a small impurity.
Disagreeing with this bit: that spread is ordinary inter-lab variance, not a disagreement about the material.
area percent is relative to what the detector saw and nothing else
Agreed. Two analysts, one trace, two integration choices, and a spread that has nothing to do with the vial.
214nm sees the peptide bond, 280nm sees the aromatics
you cannot report to two decimals off that baseline