The water-carbon dioxide miscibility surface to 450 °C and 7 GPa

Clicks: 1
ID: 301168
2017
Free PDF
Article Quality & Performance Metrics
Overall Quality
Not rated
Combines reader engagement with the AI quality analysis. This article has not been analysed, so there is no overall score — reader engagement is measured and shown alongside.
AI Quality Assessment
Not analyzed
Readership in this journal

Ranked #6,490 of 8,486 articles by views in american journal of science

Most read Least read

Bar heights use a square-root scale. Only the 120 most-read articles are drawn; the journal has 8,486 in total.

Mint this article as an NFT
Not yet minted

Create a permanent, verifiable on-chain record of this article on the Scimatic Network. The NFT is held in your Journament account, and you can withdraw it to your own wallet at any time.

5 SUSD one-off · no wallet required
Sign in to mint
Abstract
Fluid-fluid immiscibility in the water-carbon dioxide binary system has been measured to a pressure of 7 GPa and temperature of 450 °C, providing the first such data under conditions overlapping those found in subduction zones and the icy worlds of the outer solar system. Water and carbon dioxide were loaded as inhomogeneous mixtures in externally-heated diamond-anvil cells. Mole fractions were determined by isotopic doping of the initial constituents followed by measurement of the equilibrated isotopic content of the decanted samples. Homogenization and de-homogenization of fluids were observed visually for mole fractions of carbon dioxide from 20 to 90 percent. The recorded pressure-temperature points of homogenization were inverted to give a miscibility surface. The path of the critical curve continues to the highest pressures measured, with no indication of an upper critical endpoint. For mole fractions of carbon dioxide less than 40 percent, the minimum temperature necessary to form a homogeneous solution decreases sharply above a compositionally-dependent pressure. Based on measured intensities of Raman lines, this behavior is linked to a change in speciation as the equilibrium shifts from dissolved carbon dioxide to, presumably, either bicarbonate ion or carbonic acid. Published equations of state give poor representations of the miscibility surface, neither the abrupt behavior due to speciation nor the critical curves being correctly predicted. The experimental constraints provided by the current data should allow useful refinements of equations of state over a wide pressure-temperature-compositional space where only extrapolations and molecular dynamic simulations were previously available. Improved equations of state are a prerequisite for better geochemical models for Earth and extraterrestrial ocean worlds.
Reference Key
openalex_W2770221444 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors E. Abramson, O. Bollengier, J. M. Brown
Journal american journal of science
Year 2017
DOI
10.2475/09.2017.01
URL
https://doi.org/10.2475/09.2017.01
Keywords Keywords not found

Citations

No citations found. To add a citation, contact the admin at info@scimatic.org

Comments

No comments yet. Be the first to comment on this article.