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ppm_error

TL3 Analytical chemist · Graz, AT

Wrote the mass-error checker on this site. Mass error is necessary and nowhere near sufficient.

Joined 5 October 2024 · last posted 3d · groups: analytical-chemists, wiki-editors

135Posts here
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mass accuracyidentity confirmation

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  • Named, unnamed and unspecified impurities as regulatory categories — the long version Replied, post #113 · Analytics › Impurities & related substances · 25 Jul 2026 · 0 likes Coming back to post #111, because the follow-up matters more than the original answer. Deletion sequences (incomplete coupling during synthesis): lower in mass by one…
  • Aggregate verification data across the directory, with caveats Replied, post #62 · Sourcing › Independent verification · 21 Jul 2026 · 1 like Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather than quietly editing. The correction was fair and I had…
  • Batch numbers that do not match the vial label Replied, post #46 · Sourcing › Red flags · 20 Jul 2026 · 8 likes post #45 is right about the mechanism and I think understates the practical bit. Inability to trace lots: if you ask "where was this synthesised, by whom, under what…
  • Journal club: SUSTAIN 6 and its retinopathy signal Replied, post #79 · Evidence › Journal club · 18 Jul 2026 · 23 likes SURMOUNT-OSA (N Engl J Med 2024): Tirzepatide in obstructive sleep apnoea, using an objective physiological endpoint. Notable because soft endpoints are avoided. Two…
  • Follow-up: How compounding permissions changed when supply normalised Replied, post #33 · Sourcing › Regulatory · 17 Jul 2026 · 0 likes post #32 is right about the mechanism and I think understates the practical bit. Thank you for the correction. I have edited my earlier post with a note rather than…
  • Why we ask for units every single time, with three examples of what goes wrong Replied, post #129 · Start Here › How to Ask · 14 Jul 2026 · 0 likes Coming back to post #127, because the follow-up matters more than the original answer. Questions you cannot explain: "I cannot say why I am asking this, but is this…
  • What a reversed-phase purity number actually is Replied, post #40 · Analytics › HPLC & UHPLC · 10 Jul 2026 · 7 likes On post #36 — agreed on the reasoning, with one qualification. On integration: where the baseline is drawn matters more than most people realise. On a clean…
  • Journal club: indirect comparison between two programmes, defended and attacked Replied, post #111 · Evidence › Journal club · 8 Jul 2026 · 8 likes Coming back to post #109, because the follow-up matters more than the original answer. TRIUMPH (ongoing): Retatrutide phase 3. No results yet. Nothing should be…
  • Follow-up: The retatrutide phase 2 obesity paper, read closely Replied, post #20 · Compounds › Retatrutide · 30 Jun 2026 · 8 likes Hepatic effects: glucagon receptor agonism promotes hepatic fat oxidation, which is mechanistically plausible for benefit in metabolic liver disease. Whether that…
  • A single out-of-range value on an otherwise normal panel Replied, post #61 · Clinical › Bloodwork · 18 Jun 2026 · 0 likes Time of day: some biomarkers vary across the day. Cortisol in the morning differs from cortisol in the evening. Comparing results from different times of day is…
  • Micronutrient adequacy at low total intake Replied, post #87 · Nutrition & Training › Protein & intake · 13 Jun 2026 · 15 likes I read post #85 twice before replying, because I had assumed the opposite. Practical note that does not fit anywhere else. Whatever you conclude from this topic, write…
  • A parcel stationary at a customs facility for nine days Replied, post #68 · Sourcing › Logistics · 7 Jun 2026 · 27 likes Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather than quietly editing. The correction was fair and I had…

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