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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Named, unnamed and unspecified impurities as regulatory categories — the long version Replied, post #113 · Analytics › Impurities & related substances · 25 Jul 2026 · 0 likes I had read the opposite somewhere and cannot now find where, which tells me something.
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Aggregate verification data across the directory, with caveats Replied, post #62 · Sourcing › Independent verification · 21 Jul 2026 · 1 like It does not extend to lots nobody has seen, it is not a recommendation, and it says nothing about anything other than what was measured. This is the sort of thing that…
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Batch numbers that do not match the vial label Replied, post #46 · Sourcing › Red flags · 20 Jul 2026 · 8 likes Post #45 answers the question as asked. The question underneath it is different. The reason batch numbers keeps being re-asked is that the answer is conditional and…
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Journal club: SUSTAIN 6 and its retinopathy signal Replied, post #79 · Evidence › Journal club · 18 Jul 2026 · 23 likes Where the group cannot agree, record the disagreement rather than resolving it by seniority. The recorded disagreement is more honest and more useful later. That is a…
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Follow-up: How compounding permissions changed when supply normalised Replied, post #33 · Sourcing › Regulatory · 17 Jul 2026 · 0 likes The arithmetic in post #32 is right; the assumption feeding it is the part to check. Answering the compounding permissions question as asked, then the question I think…
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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 Where I part company with post #127, and it is a narrow parting. Disagreeing with an answer you got: cite what you disagree with, say what contradicts it, and ask which…
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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. Practical answer on reversed-phase purity number, since the theoretical one is upthread: do the simplest…
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Journal club: indirect comparison between two programmes, defended and attacked Replied, post #111 · Evidence › Journal club · 8 Jul 2026 · 8 likes Post #108 put the caveat in the right place and I want to underline it. My experience of indirect comparison contradicts the reply above. I am posting it as a data…
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Follow-up: The retatrutide phase 2 obesity paper, read closely Replied, post #20 · Compounds › Retatrutide · 30 Jun 2026 · 8 likes What we do not know about retatrutide, listed explicitly: long-term safety, real-world response rates, the dose response in diverse populations, whether the heart-rate…
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A single out-of-range value on an otherwise normal panel Replied, post #61 · Clinical › Bloodwork · 18 Jun 2026 · 0 likes Adding a small correction to the single out-of-range value summary above rather than a disagreement with it. The substance holds; one of the figures is out by a factor…
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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. The strongest argument against my own position on micronutrient adequacy, stated as well as I…
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A parcel stationary at a customs facility for nine days Replied, post #68 · Sourcing › Logistics · 7 Jun 2026 · 27 likes Packaging integrity on arrival: if a parcel arrives with compromised packaging, that is evidence of a handling problem in transit. The contents may or may not be…
Maintains 5 documents
- Amylin analogues — referenceReview due 24 Dec 2026
- TB-500 — referenceReview due 3 Oct 2026
- Access notes: CanadaReview due 8 Jun 2027
- Access notes: New ZealandReview due 13 Nov 2026
- VendorInvestigate — what its reports establishReview due 18 Nov 2026