Proton‐Transfer Reaction Dynamics and Energetics in Calcification and Decalcification
Abstract CaCO 3 ‐saturated saline waters at pH values below 8.5 are characterized by two stationary equilibrium states: reversible chemical calcification/decalcification associated with acid dissociation, Ca 2+ +HCO 3 − ⇌CaCO 3 +H + and reversible static physical precipitation/dissolution, Ca 2+ +CO...
Published in: | Chemistry – A European Journal |
---|---|
Main Authors: | , , |
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2014
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1002/chem.201402210 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fchem.201402210 https://onlinelibrary.wiley.com/doi/pdf/10.1002/chem.201402210 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/chem.201402210 |
id |
crwiley:10.1002/chem.201402210 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1002/chem.201402210 2024-03-24T09:04:25+00:00 Proton‐Transfer Reaction Dynamics and Energetics in Calcification and Decalcification Suwa, Ryota Hatta, Masayuki Ichikawa, Kazuhiko Japan Society for the Promotion of Science Grant-in-Aid for Scientific Research 2014 http://dx.doi.org/10.1002/chem.201402210 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fchem.201402210 https://onlinelibrary.wiley.com/doi/pdf/10.1002/chem.201402210 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/chem.201402210 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Chemistry – A European Journal volume 20, issue 42, page 13656-13661 ISSN 0947-6539 1521-3765 General Chemistry Catalysis Organic Chemistry journal-article 2014 crwiley https://doi.org/10.1002/chem.201402210 2024-02-28T02:17:30Z Abstract CaCO 3 ‐saturated saline waters at pH values below 8.5 are characterized by two stationary equilibrium states: reversible chemical calcification/decalcification associated with acid dissociation, Ca 2+ +HCO 3 − ⇌CaCO 3 +H + and reversible static physical precipitation/dissolution, Ca 2+ +CO 3 2− ⇌CaCO 3 . The former reversible reaction was determined using a strong base and acid titration. The saturation state described by the pH/ P CO2 ‐independent solubility product, [Ca 2+ ][CO 3 2− ], may not be observed at pH below 8.5 because [Ca 2+ ][CO 3 2− ]/([Ca 2+ ][HCO 3 − ]) ≪1. Since proton transfer dynamics controls all reversible acid dissociation reactions in saline waters, the concentrations of calcium ion and dissolved inorganic carbon (DIC) were expressed as a function of dual variables, pH and P CO2 . The negative impact of ocean acidification on marine calcifying organisms was confirmed by applying the experimental culture data of each P CO2 /pH‐dependent coral polyp skeleton weight (Wskel) to the proton transfer idea. The skeleton formation of each coral polyp was performed in microspaces beneath its aboral ectoderm. This resulted in a decalcification of 14 weight %, a normalized CaCO 3 saturation state Λ of 1.3 at P CO2 ≈400 ppm and pH ≈8.0, and serious decalcification of 45 % and Λ 2.5 at P CO2 ≈1000 ppm and pH ≈7.8. Article in Journal/Newspaper Ocean acidification Wiley Online Library Chemistry – A European Journal 20 42 13656 13661 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
topic |
General Chemistry Catalysis Organic Chemistry |
spellingShingle |
General Chemistry Catalysis Organic Chemistry Suwa, Ryota Hatta, Masayuki Ichikawa, Kazuhiko Proton‐Transfer Reaction Dynamics and Energetics in Calcification and Decalcification |
topic_facet |
General Chemistry Catalysis Organic Chemistry |
description |
Abstract CaCO 3 ‐saturated saline waters at pH values below 8.5 are characterized by two stationary equilibrium states: reversible chemical calcification/decalcification associated with acid dissociation, Ca 2+ +HCO 3 − ⇌CaCO 3 +H + and reversible static physical precipitation/dissolution, Ca 2+ +CO 3 2− ⇌CaCO 3 . The former reversible reaction was determined using a strong base and acid titration. The saturation state described by the pH/ P CO2 ‐independent solubility product, [Ca 2+ ][CO 3 2− ], may not be observed at pH below 8.5 because [Ca 2+ ][CO 3 2− ]/([Ca 2+ ][HCO 3 − ]) ≪1. Since proton transfer dynamics controls all reversible acid dissociation reactions in saline waters, the concentrations of calcium ion and dissolved inorganic carbon (DIC) were expressed as a function of dual variables, pH and P CO2 . The negative impact of ocean acidification on marine calcifying organisms was confirmed by applying the experimental culture data of each P CO2 /pH‐dependent coral polyp skeleton weight (Wskel) to the proton transfer idea. The skeleton formation of each coral polyp was performed in microspaces beneath its aboral ectoderm. This resulted in a decalcification of 14 weight %, a normalized CaCO 3 saturation state Λ of 1.3 at P CO2 ≈400 ppm and pH ≈8.0, and serious decalcification of 45 % and Λ 2.5 at P CO2 ≈1000 ppm and pH ≈7.8. |
author2 |
Japan Society for the Promotion of Science Grant-in-Aid for Scientific Research |
format |
Article in Journal/Newspaper |
author |
Suwa, Ryota Hatta, Masayuki Ichikawa, Kazuhiko |
author_facet |
Suwa, Ryota Hatta, Masayuki Ichikawa, Kazuhiko |
author_sort |
Suwa, Ryota |
title |
Proton‐Transfer Reaction Dynamics and Energetics in Calcification and Decalcification |
title_short |
Proton‐Transfer Reaction Dynamics and Energetics in Calcification and Decalcification |
title_full |
Proton‐Transfer Reaction Dynamics and Energetics in Calcification and Decalcification |
title_fullStr |
Proton‐Transfer Reaction Dynamics and Energetics in Calcification and Decalcification |
title_full_unstemmed |
Proton‐Transfer Reaction Dynamics and Energetics in Calcification and Decalcification |
title_sort |
proton‐transfer reaction dynamics and energetics in calcification and decalcification |
publisher |
Wiley |
publishDate |
2014 |
url |
http://dx.doi.org/10.1002/chem.201402210 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fchem.201402210 https://onlinelibrary.wiley.com/doi/pdf/10.1002/chem.201402210 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/chem.201402210 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Chemistry – A European Journal volume 20, issue 42, page 13656-13661 ISSN 0947-6539 1521-3765 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/chem.201402210 |
container_title |
Chemistry – A European Journal |
container_volume |
20 |
container_issue |
42 |
container_start_page |
13656 |
op_container_end_page |
13661 |
_version_ |
1794405635674079232 |