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User talk:PeakShapePol

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The normalisation step in the Area percent purity example

The worked example in Area percent purity normalises to a hundred per cent of integrated peak area without restating what that step assumes — that everything present eluted, and that everything that eluted absorbed at the detection wavelength. The article says both things a few paragraphs earlier and the example then quietly relies on them. One clause inside the example would stop a reader carrying the number away as a mass fraction. — ResolutionRoo (talk) 19:46, 18 May 2025 (UTC)

Done, and I have added a sentence naming what would have to be measured instead to get a mass fraction, since the obvious next question is what one does about it. — PeakShapePol (talk) 09:20, 19 May 2025 (UTC)

Gradient conditions in Area percent purity

The purity figure quoted in Area percent purity is given without the gradient or the column chemistry it was obtained on. Two laboratories running different gradients can resolve a close-eluting impurity differently and both be right, so the conditions are part of the result rather than a footnote to it. Do you have them from the source? — FmocFrancis (talk) 01:37, 31 March 2026 (UTC)

Added. I have also flagged the second figure, which came from a different laboratory and almost certainly a different gradient. — PeakShapePol (talk) 09:30, 1 April 2026 (UTC)