High overall agreement among CO2 quantification methods can mask differences in calcium carbonate recovery: A four-method known-addition study across eight cement-related powders (supporting data and code)

Source data, analysis-ready tables, traceability ledgers, code, and expected outputs supporting a 21-level known-addition study of four CO2 quantification methods across eight cement-related powders and an accelerated-carbonation application. The package includes source measurement workbooks, available raw or instrument-exported files, the canonical analysis table covering 168 matrix-level combinations, derived tables, analysis and figure code, and SHA-256 manifests. The core statistical analysis can be rerun from the deposited package. The package also records raw-data boundaries: all canonical TOF-MS values are traceable to measurement workbooks, while native instrument folders were present in the local archive for 15 of 35 values and not found for 20 of 35 values. Third-party publications, standards, software, and COD structure files are not redistributed. Data and documentation are licensed under CC BY 4.0. Source code under 02_code/ is licensed under the MIT License. The ZIP contains LICENSE_DATA_DOCS.txt and LICENSE_CODE.txt.