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Calcium isotope fractionation between aqueous compounds relevant to low-temperature geochemistry, biology and medicine

Stable Ca isotopes are fractionated between bones, urine and blood of animals and between soils, roots and leaves of plants by >1000 ppm for the (44)Ca/(40)Ca ratio. These isotopic variations have important implications to understand Ca transport and fluxes in living organisms; however, the mecha...

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Autores principales: Moynier, Frédéric, Fujii, Toshiyuki
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5343585/
https://www.ncbi.nlm.nih.gov/pubmed/28276502
http://dx.doi.org/10.1038/srep44255
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author Moynier, Frédéric
Fujii, Toshiyuki
author_facet Moynier, Frédéric
Fujii, Toshiyuki
author_sort Moynier, Frédéric
collection PubMed
description Stable Ca isotopes are fractionated between bones, urine and blood of animals and between soils, roots and leaves of plants by >1000 ppm for the (44)Ca/(40)Ca ratio. These isotopic variations have important implications to understand Ca transport and fluxes in living organisms; however, the mechanisms of isotopic fractionation are unclear. Here we present ab initio calculations for the isotopic fractionation between various aqueous species of Ca and show that this fractionation can be up to 3000 ppm. We show that the Ca isotopic fractionation between soil solutions and plant roots can be explained by the difference of isotopic fractionation between the different first shell hydration degree of Ca(2+) and that the isotopic fractionation between roots and leaves is controlled by the precipitation of Ca-oxalates. The isotopic fractionation between blood and urine is due to the complexation of heavy Ca with citrate and oxalates in urine. Calculations are presented for additional Ca species that may be useful to interpret future Ca isotopic measurements.
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spelling pubmed-53435852017-03-14 Calcium isotope fractionation between aqueous compounds relevant to low-temperature geochemistry, biology and medicine Moynier, Frédéric Fujii, Toshiyuki Sci Rep Article Stable Ca isotopes are fractionated between bones, urine and blood of animals and between soils, roots and leaves of plants by >1000 ppm for the (44)Ca/(40)Ca ratio. These isotopic variations have important implications to understand Ca transport and fluxes in living organisms; however, the mechanisms of isotopic fractionation are unclear. Here we present ab initio calculations for the isotopic fractionation between various aqueous species of Ca and show that this fractionation can be up to 3000 ppm. We show that the Ca isotopic fractionation between soil solutions and plant roots can be explained by the difference of isotopic fractionation between the different first shell hydration degree of Ca(2+) and that the isotopic fractionation between roots and leaves is controlled by the precipitation of Ca-oxalates. The isotopic fractionation between blood and urine is due to the complexation of heavy Ca with citrate and oxalates in urine. Calculations are presented for additional Ca species that may be useful to interpret future Ca isotopic measurements. Nature Publishing Group 2017-03-09 /pmc/articles/PMC5343585/ /pubmed/28276502 http://dx.doi.org/10.1038/srep44255 Text en Copyright © 2017, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Moynier, Frédéric
Fujii, Toshiyuki
Calcium isotope fractionation between aqueous compounds relevant to low-temperature geochemistry, biology and medicine
title Calcium isotope fractionation between aqueous compounds relevant to low-temperature geochemistry, biology and medicine
title_full Calcium isotope fractionation between aqueous compounds relevant to low-temperature geochemistry, biology and medicine
title_fullStr Calcium isotope fractionation between aqueous compounds relevant to low-temperature geochemistry, biology and medicine
title_full_unstemmed Calcium isotope fractionation between aqueous compounds relevant to low-temperature geochemistry, biology and medicine
title_short Calcium isotope fractionation between aqueous compounds relevant to low-temperature geochemistry, biology and medicine
title_sort calcium isotope fractionation between aqueous compounds relevant to low-temperature geochemistry, biology and medicine
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5343585/
https://www.ncbi.nlm.nih.gov/pubmed/28276502
http://dx.doi.org/10.1038/srep44255
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