Nelson, Paul N., and Green, Hannah (2025) Comment on ‘Investigating CO₂ sequestration via enhanced rock weathering: Effects of temperature and citric acid on dolomite and basalt’. Journal of Cleaner Production, 533. 147000.

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Abstract

Xu et al. (2024) reported a carefully conducted soil incubation study into CO2 capture following application of crushed dolomite or basalt, but we have re-examined their data and arrived at different conclusions. While Xu et al. collected sufficient C data to measure CO2 capture directly, they instead estimated it from the Mg balance and the assumption that release of Mg from the applied rock was associated with carbonic acid weathering. Although cation-based approaches have been used widely in the past, they do not provide an accurate estimate of CO2 capture in most situations (Green et al., 2024; Hasemer et al., 2024). We show here that when CO2 capture was calculated directly from the C balance, the effects of the treatments on CO2 capture differed from the original published estimates; dolomite addition led to CO2 capture, but basalt addition did not.

Item ID:	89437
Item Type:	Article (Commentary)
ISSN:	0959-6526
Keywords:	carbonate carbon dioxide removal enhanced weathering incubation silicate
Copyright Information:	© 2025 Elsevier Ltd. All rights are reserved, including those for text and data mining, AI training, and similar technologies. Accepted Version: © 2025. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Date Deposited:	12 Nov 2025 00:33
FoR Codes:	41 ENVIRONMENTAL SCIENCES > 4101 Climate change impacts and adaptation > 410101 Carbon sequestration science @ 60% 41 ENVIRONMENTAL SCIENCES > 4106 Soil sciences > 410604 Soil chemistry and soil carbon sequestration (excl. carbon sequestration science) @ 40%
SEO Codes:	18 ENVIRONMENTAL MANAGEMENT > 1806 Terrestrial systems and management > 180605 Soils @ 100%
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