Zhuang et al. (2026): Manganese Oxide-Mediated Reactions with Olivine Dissolution Products: A Double-Edged Sword for Ocean Alkalinity Enhancement
Wen Zhuang, Feng Li, Tianqiang Zhu, Liwen Zheng, Minghao Zhu and Jihua Liu, IN: Environmental Science & Technology, https://doi.org/10.1021/acs.est.5c16120
Olivine-based ocean alkalinity enhancement (OAE) is a promising carbon dioxide removal strategy, yet interactions with layered manganese oxides-ubiquitous minerals controlling trace metal biogeochemistry in marine sediments-remain poorly understood. The authors investigated these mechanisms using synthetic birnessite, a natural analogue of hexagonal layered Mn oxides, in controlled laboratory experiments in seawater under three scenarios reflecting different OAE deployment strategies: direct olivine-birnessite contact, exposure to simulated olivine leachate, and repeated alkaline inputs.