{"refrec":{"BRefID":351449,"RR":"<b>Olsen, E.K.; Watkins, J.M.; Devriendt, L.S.</b> (2022). Oxygen isotopes of calcite precipitated at high ionic strength: CaCO<sub>3</sub>-DIC fractionation and carbonic anhydrase inhibition. <i>Geochim. Cosmochim. Acta 325</i>: 170-186. <a href=\"https://dx.doi.org/10.1016/j.gca.2022.01.028\" target=\"_blank\">https://dx.doi.org/10.1016/j.gca.2022.01.028</a>","BEntID":349155,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Geochim. Cosmochim. Acta 325</i>: 170-186. <a href=\"https://dx.doi.org/10.1016/j.gca.2022.01.028\" target=\"_blank\">https://dx.doi.org/10.1016/j.gca.2022.01.028</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Olsen, E.K.; Watkins, J.M.; Devriendt, L.S.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Olsen, E.K.; Watkins, J.M.; Devriendt, L.S.","Englishabstract":"<p>    Background electrolytes affect    <a        href=\"https://www.sciencedirect.com/topics/earth-and-planetary-sciences/calcite\"        title=\"Learn more about calcite from ScienceDirect's AI-generated Topic Pages\"    >        calcite    </a>    precipitation and dissolution rates and hence have the potential to impact    kinetic isotope fractionation between calcite and the    <a        href=\"https://www.sciencedirect.com/topics/earth-and-planetary-sciences/dissolved-inorganic-carbon\"        title=\"Learn more about dissolved inorganic carbon from ScienceDirect's AI-generated Topic Pages\"    >        dissolved inorganic carbon    </a>    (DIC) species. We grew inorganic calcite from NaCl-CaCl<sub>2</sub>solutions (<em>T</em> = 25 °C, pH = 8.3, and crystal growth rate = 10    <sup>−6.3 ± 0.3</sup> mol m<sup>−2</sup> s<sup>−1</sup>) to test for    potential ionic strength effects on the    <a        href=\"https://www.sciencedirect.com/topics/earth-and-planetary-sciences/oxygen-isotope\"        title=\"Learn more about oxygen isotope from ScienceDirect's AI-generated Topic Pages\"    >        oxygen isotope    </a>    fractionation between calcite and an isotopically equilibrated    <a        href=\"https://www.sciencedirect.com/topics/earth-and-planetary-sciences/inorganic-carbon\"        title=\"Learn more about inorganic carbon from ScienceDirect's AI-generated Topic Pages\"    >        inorganic carbon    </a>    pool (α<sub>c/EIC</sub>). Calcite was grown in the presence of the enzyme    <a        href=\"https://www.sciencedirect.com/topics/earth-and-planetary-sciences/carbonic-anhydrase\"        title=\"Learn more about carbonic anhydrase from ScienceDirect's AI-generated Topic Pages\"    >        carbonic anhydrase    </a>    from bovine erythrocytes (bCA) to promote isotopic equilibration of the DIC    pool.</p><p>    No evidence of an ionic strength effect on α<sub>c/EIC</sub> was found forNaCl concentrations up to 0.35 M (1000lnα<sub>c/w</sub> = 28.0 ± 0.1;    <em>n</em> = 7). For experiments conducted with [NaCl] > 0.35 M, the DIC    pool could not be maintained in isotopic equilibrium with water due to the    inhibitory effect of NaCl on bCA. The use of other types of CA may be    required to maintain isotopic equilibration of DIC in solution with ionic    strength close to or above that of seawater.</p><p>    The oxygen isotope results were modeled successfully with an isotopic box    model for a CO<sub>2</sub>-fed solution that tracks the    <a        href=\"https://www.sciencedirect.com/topics/earth-and-planetary-sciences/isotopic-composition\"        title=\"Learn more about isotopic composition from ScienceDirect's AI-generated Topic Pages\"    >        isotopic composition    </a>    of each DIC species and CaCO<sub>3</sub>. The experimental and modeling    results suggest that the efficacy of bCA decreases exponentially withincreasing [NaCl]. We quantify the salt effect on the quantity <em>k</em>    <sub>cat</sub>/<em>K</em><sub>M</sub>, which relates the catalyzed rate    constant for CO<sub>2</sub> hydration to the concentration of bCA. The salt    effect can be implemented in models of    <a        href=\"https://www.sciencedirect.com/topics/earth-and-planetary-sciences/biomineralization\"        title=\"Learn more about biomineralization from ScienceDirect's AI-generated Topic Pages\"    >        biomineralization    </a>    with potential to extend our knowledge of oxygen isotope vital effects in    marine organisms.</p>","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Oxygen isotopes of calcite precipitated at high ionic strength: CaCO<sub>3</sub>-DIC fractionation and carbonic anhydrase inhibition","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-04-24 01:33:11.255321","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Oxygen isotopes; Calcite; Kinetic isotope effects; Carbonic anhydrase","OtherDescriptors":null,"Notes":null,"AnaPub":2022,"MonPub":null,"DateUpdate":"2022-07-19","DateCreate":"2022-04-14","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000822547100009","VABBcode":null,"OpenAcc":1,"DOI":"10.1016/j.gca.2022.01.028"},"refs":null,"anarec":{"AnaID":351449,"PubliDate":2022,"Pagination":"170-186","XtraPublOfAnaID":null,"ISBN":null,"Volume":"325","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":42901,"SerRR":"Geochimica et Cosmochimica Acta. Elsevier: Oxford,New York etc..  ISSN 0016-7037; e-ISSN 1872-9533","StandardTitleSer":"Geochimica et Cosmochimica Acta","ISSN":"0016-7037","AbbrevSer":"Geochim. Cosmochim. 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