Seawater carbonate chemistry and physiological response of diatoms to olivine dissolution

In this study, we investigated the short-term synergistic CO2 removal effects of an olivine–diatom coculture system by introducing fine-grained olivine powder directly into diatom cultures and observing the biological response. To account for potential interference from olivine particles in cell counting, we conducted additional experiments in which olivine particles were enclosed within a dialysis bag to explore both the direct and indirect influences of diatom growth on olivine dissolution. We assessed the extent by which growth-mediated uptake of H4SiO4 by diatoms accelerated olivine dissolution. Finally, we evaluated the comprehensive CO2 removal efficiency of the olivine–diatom coculture system through the fixation of organic and inorganic carbon.