https://schrodinger.ca/posts/ Short-form technical content by Marcos Daniel Bueno Rosa. en Fri, 24 Apr 2026 14:00:28 +0000 https://schrodinger.ca/posts/iso-17025-traceability-cala-auditor-nrc/ https://schrodinger.ca/posts/iso-17025-traceability-cala-auditor-nrc/ Fri, 24 Apr 2026 14:00:11 +0000 Your calibration certificate says "traceable." Your CALA auditor wants to know: traceable to what? ISO 17025:2017 §6.5 requires that calibration be traceable to the International System of Units SI through an unbroken chain of comparisons, each with stated measurement uncertainty. "Traceable to… https://schrodinger.ca/posts/sagd-h2s-reference-poisoning-silent-drift-ph-data/ https://schrodinger.ca/posts/sagd-h2s-reference-poisoning-silent-drift-ph-data/ Wed, 22 Apr 2026 14:00:03 +0000 The Ag/AgCl reference in your SAGD produced water loop is already poisoned. Not "maybe degraded." Poisoned. H₂S reacts with the silver chloride coating to form Ag₂S — a sulfide film that blocks ion exchange and shifts your reference potential in one direction, permanently. In Athabasca bitumen… https://schrodinger.ca/posts/h2s-reference-electrode-failure/ https://schrodinger.ca/posts/h2s-reference-electrode-failure/ Thu, 16 Apr 2026 19:46:16 +0000 Your reference electrode in an amine treating unit is not failing — it already failed. Ag/AgCl reference electrodes in sour service read 15 to 20 mV high within weeks of installation. The silver chloride surface reacts with H₂S, forming Ag₂S. The reference potential shifts, and every measurement…