h.espinoza
TL2 Moderator · Monterrey
Contributes reviews on supplier material. Based in Monterrey.
Joined 11 December 2024 · last posted 19h
80Posts here
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Most-liked posts
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Why quantitation is the hard part, not detection Replied, post #3 · Analytics › Home & field testing · 30 Dec 2024 · 31 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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Checking someone else's arithmetic: a worked example thread Replied, post #63 · Practice › Reconstitution · 2 Jul 2025 · 30 likes I read post #61 twice before replying, because I had assumed the opposite. Why "add 2 mL" is not an instruction: the powder in the vial takes up space. "Add 2 mL to a…
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Requesting a page: what makes a good request — what changed since Replied, post #49 · Documentation › Wiki requests · 10 Oct 2024 · 30 likes post #48 is right about the mechanism and I think understates the practical bit. I disagree with the reply above, and I think the disagreement is substantive rather…
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Review: a draft on reconstitution arithmetic, with objections Replied, post #78 · Documentation › Doc review · 28 Mar 2025 · 29 likes Worth separating two things that post #74 runs together. Citation checking: if a maintained page cites a paper, the citation should match what the paper actually says.…
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A reconstituted vial's beyond-use date and the reasoning behind common figures Replied, post #66 · Practice › Storage & stability · 6 Jun 2026 · 26 likes I read post #64 twice before replying, because I had assumed the opposite. Dating prepared solutions: write the date reconstitution on the vial in permanent marker. If…
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Adducts: sodium, potassium, and the peak you did not expect Replied, post #36 · Analytics › Mass spectrometry · 16 Mar 2025 · 26 likes Two things before anyone answers the substance. First, the context in the first post is clear and specific. Second, the question is framed so that an answer can…
Where this member posts
Badges earned, in order
| Badge | Tier | Granted |
|---|---|---|
| Basic User | bronze | 14 Dec 2024 |
| Read the Guidelines | bronze | 15 Dec 2024 |
| First Reply | bronze | 17 Dec 2024 |
| First Link | bronze | 20 Dec 2024 |
| First Quote | bronze | 25 Dec 2024 |
| Asked Well | bronze | 28 Dec 2024 |
| Member | bronze | 29 Dec 2024 |
| Welcome | bronze | 30 Dec 2024 |
| First Tag | bronze | 10 Jan 2025 |
| Editor | bronze | 22 Jan 2025 |
| Generous | bronze | 25 Jan 2025 |
| Sourced | bronze | 7 Feb 2025 |
| Reader | bronze | 23 Mar 2025 |
| First Solution | bronze | 1 May 2025 |
| Nice Post | bronze | 29 May 2025 |
| Popular Link | silver | 18 Jun 2025 |
| First Vendor Report | bronze | 25 Aug 2025 |
| Thank You | silver | 26 Aug 2025 |
| Good Post | silver | 15 Sep 2025 |
| De-escalator | gold | 1 Oct 2025 |
| Welcoming | silver | 2 Oct 2025 |
| Anniversary | silver | 11 Dec 2025 |