Equilibration Times of Dissolved Inorganic Carbon During pH Transitions
Equilibration times of dissolved inorganic carbon (DIC) depend on conversion reactions between CO 2 (aq) and the dissociation products of carbonic acid [ S = (H 2 CO 3 ) + (HCO 3 − ) + (CO 3 2− )]. Here, we develop analytical equations and a numerical model to calculate chemical equilibration times...
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crfrontiers:10.3389/feart.2021.792858 2024-02-11T10:02:52+01:00 Equilibration Times of Dissolved Inorganic Carbon During pH Transitions Sade, Ziv Hegyi, Shahar Halevy, Itay European Research Council 2022 http://dx.doi.org/10.3389/feart.2021.792858 https://www.frontiersin.org/articles/10.3389/feart.2021.792858/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Earth Science volume 9 ISSN 2296-6463 General Earth and Planetary Sciences journal-article 2022 crfrontiers https://doi.org/10.3389/feart.2021.792858 2024-01-26T10:07:46Z Equilibration times of dissolved inorganic carbon (DIC) depend on conversion reactions between CO 2 (aq) and the dissociation products of carbonic acid [ S = (H 2 CO 3 ) + (HCO 3 − ) + (CO 3 2− )]. Here, we develop analytical equations and a numerical model to calculate chemical equilibration times of DIC during pH transitions in buffered and unbuffered solutions. We approximate the equilibration degree of the DIC reservoir by the smaller of the CO 2 (aq) and S pools at the new pH, since the smaller pool is always farther from equilibrium during the chemical evolution. Both the amount of DIC converted and the rate of conversion differ between a pH increase and decrease, leading to distinct equilibration times for these general cases. Alkalinity perturbations in unbuffered solutions initially drive pH overshoots (increase or decrease) relative to the new equilibrium pH. The increased rates of DIC conversion associated with the pH overshoot yield shorter equilibration times compared to buffered solutions. Salinity has opposing effects on buffered and unbuffered solutions, decreasing and increasing equilibration times, respectively. Article in Journal/Newspaper Carbonic acid Frontiers (Publisher) Frontiers in Earth Science 9 |
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General Earth and Planetary Sciences |
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General Earth and Planetary Sciences Sade, Ziv Hegyi, Shahar Halevy, Itay Equilibration Times of Dissolved Inorganic Carbon During pH Transitions |
topic_facet |
General Earth and Planetary Sciences |
description |
Equilibration times of dissolved inorganic carbon (DIC) depend on conversion reactions between CO 2 (aq) and the dissociation products of carbonic acid [ S = (H 2 CO 3 ) + (HCO 3 − ) + (CO 3 2− )]. Here, we develop analytical equations and a numerical model to calculate chemical equilibration times of DIC during pH transitions in buffered and unbuffered solutions. We approximate the equilibration degree of the DIC reservoir by the smaller of the CO 2 (aq) and S pools at the new pH, since the smaller pool is always farther from equilibrium during the chemical evolution. Both the amount of DIC converted and the rate of conversion differ between a pH increase and decrease, leading to distinct equilibration times for these general cases. Alkalinity perturbations in unbuffered solutions initially drive pH overshoots (increase or decrease) relative to the new equilibrium pH. The increased rates of DIC conversion associated with the pH overshoot yield shorter equilibration times compared to buffered solutions. Salinity has opposing effects on buffered and unbuffered solutions, decreasing and increasing equilibration times, respectively. |
author2 |
European Research Council |
format |
Article in Journal/Newspaper |
author |
Sade, Ziv Hegyi, Shahar Halevy, Itay |
author_facet |
Sade, Ziv Hegyi, Shahar Halevy, Itay |
author_sort |
Sade, Ziv |
title |
Equilibration Times of Dissolved Inorganic Carbon During pH Transitions |
title_short |
Equilibration Times of Dissolved Inorganic Carbon During pH Transitions |
title_full |
Equilibration Times of Dissolved Inorganic Carbon During pH Transitions |
title_fullStr |
Equilibration Times of Dissolved Inorganic Carbon During pH Transitions |
title_full_unstemmed |
Equilibration Times of Dissolved Inorganic Carbon During pH Transitions |
title_sort |
equilibration times of dissolved inorganic carbon during ph transitions |
publisher |
Frontiers Media SA |
publishDate |
2022 |
url |
http://dx.doi.org/10.3389/feart.2021.792858 https://www.frontiersin.org/articles/10.3389/feart.2021.792858/full |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_source |
Frontiers in Earth Science volume 9 ISSN 2296-6463 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/feart.2021.792858 |
container_title |
Frontiers in Earth Science |
container_volume |
9 |
_version_ |
1790598951771045888 |