Injection volume, overload, and peak distortion — one year on

Injection volume, overload, and peak distortion — one year on Writing it up because I had to work it out twice and would rather nobody else did.

Posting a small dataset on Injection volume. It is mine, it is uncontrolled, and the method is stated so it can be discounted appropriately.

What I would like is not agreement but a second dataset collected by someone with no stake in mine. If one exists I would rather read it than argue for this one.

That is the distinction I keep failing to hold on to. Written down now.

The opening post put the caveat in the right place and I want to underline it.

Detection wavelength: 214 nm detects the peptide bond and is relatively insensitive to composition. 280 nm detects aromatic residues and is strongly composition-dependent. Area percent at one wavelength is not area percent at the other.

Worth checking against a second source before it gets quoted onward.

On integration: where the baseline is drawn matters more than most people realise. On a clean chromatogram with well-resolved peaks the choice is inconsequential. On a chromatogram with a trailing shoulder or a rising baseline it matters. Differences of one to two percentage points between defensible integrations are ordinary.

That is my reading. Someone else read the same page differently and was reasonable.

Quietly grateful for the plain phrasing. Not every thread gets that.