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Proton-controlled mechanism for coupling among proton production/consumption reactions in CaCO3-oversaturated waters or calcifying organism-inhabited seawaters
Kazuhiko Ichikawa (1,*)
(1) Graduate School of Environmental Earth Science, Hokkaido University, Sapporo, JP-060-0810, Japan
(*) Corresponding Author
Received: 08 Jun 2010 | Accepted: 18 Oct 2010 | Published: 22 Dec 2010 | Issue Date: December 2010
Abstract
The CaCO3-oversaturated weakly basic water at around pH=8 was proved by the novel simple equations (e.g. log [Ca2+] = -2pH -logPCO2 + 9.94) derived from material energetics and proton-controlled mechanism for coupling among proton/hydroxide production/consumption reactions (e.g. CaCO3 + H+↔HCO3- + Ca2+) in equilibrium with atmospheric carbon dioxide. The cyclic/oscillating variation between pH=8.3 and 8.0 for marine calcifying organism-inhabited paleo and preindustrial seawaters was elucidated by applying the improved proton-controlled mechanismto biochemical reactions in cytoplasts or host tissues of marine calcifying phytoplanktons and phytosymbiont-bearing corals/zooplanktons. It was revealed that photosynthesis enhances biogenic calcificationand vice versa, as the thicker growth of CaCO3-made outer casings causes proton production and photosynthesis continuously needs protons to produce CO2(aq) from major HCO3-. The correlation between calcification and photosynthesis creates a number of stationary states with respect to oscillating pH variation. Marine biogenic calcification reaction releases no CO2 to atmosphere and is no positive feedback to rising atmospheric PCO2 levels.
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DOI: 10.5155/eurjchem.1.4.246-251.156
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DOI Link: https://doi.org/10.5155/eurjchem.1.4.246-251.156
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European Journal of Chemistry 2010, 1(4), 246-251 | doi: https://doi.org/10.5155/eurjchem.1.4.246-251.156 | Get rights and content
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