blank_injection
TL2 Analytical chemist · Trondheim, NO
Carryover, blanks, and the ghost peak that turns out to be last week"s standard.
Joined 3 January 2025 · last posted 3d · groups: analytical-chemists
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Reconstituting a multi-strength kit without mixing yourself up — what changed since Replied, post #42 · Practice › Reconstitution · 17 Jul 2026 · 32 likes A vial that will not fully dissolve: check in order: is the diluent genuinely room temperature (some preservatives crystallise in cold), is the vial being warmed gently…
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Coming back to: Lateral-flow and colorimetric approaches: the specificity problem Replied, post #62 · Analytics › Home & field testing · 30 Jun 2026 · 31 likes Lateral-flow devices: like a rapid COVID test. They have a reagent strip and produce a colour result. They are quick but not precise and not intended for quantitative…
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Carryover and the ghost peak from last week's standard Replied, post #29 · Analytics › HPLC & UHPLC · 4 Apr 2025 · 30 likes post #28 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…
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What a reversed-phase purity number actually is Replied, post #93 · Analytics › HPLC & UHPLC · 25 Jul 2026 · 29 likes System suitability testing: injections run before and during the sample run to establish whether the instrument, column and method were performing when the sample was…
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Second pass at: Triple agonism: additive, synergistic, or neither? Replied, post #36 · Compounds › Retatrutide · 11 Apr 2025 · 28 likes The phase 2 obesity paper reported dose-dependent weight reduction of a magnitude that attracted attention. It also reported dose-dependent heart-rate increases. The…
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Second pass at: Fasting versus non-fasting and which tests care Replied, post #3 · Clinical › Bloodwork · 16 Dec 2025 · 27 likes I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The distinction being drawn does not survive when you look at…
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