Temperature dependence of calcite dissolution kinetics in seawater
نویسندگان
چکیده
منابع مشابه
Catalysis and chemical mechanisms of calcite dissolution in seawater.
Near-equilibrium calcite dissolution in seawater contributes significantly to the regulation of atmospheric [Formula: see text] on 1,000-y timescales. Despite many studies on far-from-equilibrium dissolution, little is known about the detailed mechanisms responsible for calcite dissolution in seawater. In this paper, we dissolve 13C-labeled calcites in natural seawater. We show that the time-ev...
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6-8 large (300x300 μm) 13C-labeled calcite grains were embedded in 1-inch epoxy discs. Discs were then polished to 0.25 μm and reacted for 48 hours in an experimental setup similar to the dissolution experiments described in the Methods section and in Subhas et al. (2015). The alkalinity contribution of the epoxy resin to alkalinity over the course of the 48-hour experiment was minimal (at most...
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The composition of carbonate minerals formed in past and present oceans is assumed to be significantly controlled by temperature and seawater composition. To determine if and how temperature is kinetically responsible for the amount of Mg incorporated in calcite, we quantified the influence of temperature and specific dissolved components on the complex mechanism of calcite precipitation in sea...
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[1] Fish have been shown to produce high (10 to 48 mol %) magnesium calcite as part of the physiological mechanisms responsible for maintaining salt and water balance. The importance of this source to the marine carbon cycle is only now being considered. In this paper, we report the first measurements of the solubility of this CaCO3 in seawater. The resulting solubility (pK*sp = 5.89 0.09) is a...
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ژورنال
عنوان ژورنال: Geochimica et Cosmochimica Acta
سال: 2019
ISSN: 0016-7037
DOI: 10.1016/j.gca.2018.11.037