Primary source: www.oecd.org/content/dam/oecd/en/publications/reports/1992/07/test-no-301-ready-biodegradability_g1gh2913/9789264070349-en.pdf
Verified locator: OECD Guideline for Testing of Chemicals 301, adopted 17 July 1992. Method 301 B, carbon-dioxide evolution test, §§1–3, printed p. 18: applicability to nonvolatile substances of known carbon content, CO2-free aeration, barium/sodium hydroxide traps and titration or inorganic-carbon measurement, with blank inoculum correction. General §§7–9 discuss composition and physical applicability.
Additional precise locator: General principle of the tests, paragraph 4, printed p. 1 of the 1992 guideline. Parallel inoculum blanks correct endogenous activity, but the guideline explicitly notes that endogenous activity with the test chemical will not exactly match the blank control. This distinction motivates separating blank sampling uncertainty from possible nonadditive background changes in polymer-carbon recovery.
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