Measurements in Geochemical Carbon Dioxide Removal Executive Summary

Geochemical CDR technologies speed up the reactions of materials with air or other CO2-bearing gases and convert the CO2 into solid carbonate minerals or dissolved inorganic carbon in the ocean. [...] Such approaches include ex situ, in situ, and sufacial mineralisation (Figure 1), and methods of spreading minerals onto the land surface (enhanced weathering) or technologies that promote and increase in alkalinity in the ocean (ocean alkalinity enhancement). [...] In this work, aspects of measurement in geochemical CDR are considered with the objectives of: i) accounting for carbon accumulation in a material or solution, ii) assessing the capacity of the material to react with carbon dioxide, iii) understanding how material properties may impact the speed of reaction with CO2, iv) collecting sufficient information on a material to aid in the design of a rea. [...] As part of the Industrial Decarbonation Research and Innovation Centre (IDRIC) we have created a guidance document for these analytical techniques in the form of standard operating procedures, tailored to meet the needs of geochemical CDR projects. [...] Given the often heterogeneous nature of alkaline materials and the range of technologies that might facilitate their reaction for CO2, this document is for guidance only and the protocols should be adapted to suit the needs of the user.