a.nascimento
TL2 · Setúbal
Contributes reviews on supplier material. Based in Setúbal.
Joined 19 February 2025 · last posted 3h
84Posts here
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Adducts: sodium, potassium, and the peak you did not expect — does this still hold? Replied, post #101 · Analytics › Mass spectrometry · 9 Apr 2026 · 29 likes My experience of Adducts contradicts the reply above. I am posting it as a data point rather than as a refutation, because one person's experience is exactly that.
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Packaging that arrived damaged: documenting it properly — a second dataset Replied, post #5 · Sourcing › Logistics · 7 Dec 2025 · 29 likes Split shipments reduce single-point risk and increase the number of transits. Which trade is right depends on what you are protecting against.
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Follow-up: A supplier that answers analytical questions with restated claims Replied, post #50 · Sourcing › Red flags · 14 Jan 2026 · 28 likes Building on post #48 rather than restating it. Rapid supplier turnover: a supplier that changes corporate structure, domain name, or contact repeatedly in short time…
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Converting between mg/mL and units per dose, both directions — the long version Replied, post #10 · Practice › Reconstitution · 17 Apr 2026 · 27 likes Preservative effectiveness is tested against a defined microbial challenge under defined conditions. It is not a licence to treat an entered vial as sterile…
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[2026 update] New subcategory: rationale and scope Replied, post #68 · Meta › Announcements · 15 Dec 2024 · 25 likes Building on post #66 rather than restating it. I would put moderate confidence on the mainstream reading of New subcategory and no more. That is not scepticism for its…
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Carryover and the ghost peak from last week's standard Replied, post #11 · Analytics › HPLC & UHPLC · 2 Apr 2025 · 24 likes Two things can be true about carryover at once: the mechanism is plausible and the evidence for the size of the effect is thin. Most of the argument here is people…
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Badges earned, in order
| Badge | Tier | Granted |
|---|---|---|
| Basic User | bronze | 21 Feb 2025 |
| Read the Guidelines | bronze | 21 Feb 2025 |
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| Good Post | silver | 31 May 2025 |
| Sourced | bronze | 12 Jun 2025 |
| Consistently Generous | silver | 25 Jun 2025 |
| Welcoming | silver | 15 Jul 2025 |
| Thank You | silver | 31 Jul 2025 |
| Gives Back | gold | 20 Oct 2025 |
| Anniversary | silver | 19 Feb 2026 |