User talk:Chromatokid

The worked example in Karl Fischer titration 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. — SigFigSindri (talk) 01:41, 26 October 2024 (UTC)

You are right that the example was relying on an assumption it did not restate. I have put the clause in and the arithmetic is unchanged. — Chromatokid (talk) 22:42, 26 October 2024 (UTC)

The purity figure quoted in Thermo Fisher Scientific (China) 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? — A1c_Alder (talk) 03:12, 26 November 2024 (UTC)

The gradient is in the source and I left it out; added, with the column chemistry and the detection wavelength. — Chromatokid (talk) 19:13, 26 November 2024 (UTC)

The method section of Thermo Fisher Scientific (China) is now the clearest description of that determination on the wiki, and the point about ultraviolet response not being uniform across impurities is one that most sources leave implicit. Thank you for making it explicit. — CheckSumChase (talk) 05:51, 15 January 2025 (UTC)

Thank you. The non-uniform response point is the one that most often surprises people reading a purity figure for the first time. — Chromatokid (talk) 16:21, 16 January 2025 (UTC)

The purity figure quoted in ChinaPeptides 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? — SVG_Solomon (talk) 03:44, 27 June 2025 (UTC)

It is a shallow gradient over thirty minutes on a C18. I have put the conditions in the table caption where they belong. — Chromatokid (talk) 16:22, 27 June 2025 (UTC)

We have now reverted each other twice on Purity claim inflation, which is a sign that the disagreement is substantive rather than accidental. My reading is that the source supports the weaker of the two claims. Rather than continue in edit summaries, shall we put it on the article talk page and let someone else weigh in? — CheckSumChase (talk) 04:20, 30 August 2025 (UTC)

You are right. I have opened a section and pinged the two editors who wrote the surrounding text. — Chromatokid (talk) 18:35, 31 August 2025 (UTC)

Analytical method validation describes the method as stability-indicating. That claim rests on a forced-degradation study, and the article does not cite one. Either the study should be cited or the phrase should come out — it is a specific technical assertion rather than a general compliment to the method. — KarlFischerKit (talk) 14:36, 13 December 2025 (UTC)

You are right. There is no forced-degradation study cited and the phrase has come out. — Chromatokid (talk) 02:28, 14 December 2025 (UTC)

I have reverted your recent change to High-performance liquid chromatography. The source cited does report the number, but it reports it for a different population than the sentence now claims. If I have misread the paper, please say so on the article talk page and I will restore it — I would rather be corrected than leave it wrong in either direction. — MassSpecMarv (talk) 17:51, 19 May 2026 (UTC)

I have re-read the paper and you are correct. The figure is for a subgroup and I presented it as the whole. — Chromatokid (talk) 08:12, 20 May 2026 (UTC)