Zeta potential in intact natural sandstones at elevated temperatures

Jan Vinogradov (Corresponding Author), Matthew D. Jackson

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Abstract

We report measurements of the zeta potential of natural sandstones saturated with NaCl electrolytes of varying ionic strengths at temperatures up to 150°C. The zeta potential is always negative but decreases in magnitude with increasing temperature at low ionic strength (0.01 M) and is independent of temperature at high ionic strength (0.5 M). The pH also decreases with increasing temperature at low ionic strength but remains constant at high ionic strength. The temperature dependence of the zeta potential can be explained by the temperature dependence of the pH. Our findings are consistent with published models of the zeta potential, so long as the temperature dependence of the pH at low ionic strength is accounted for and can explain the hitherto contradictory results reported in previous studies.
Original languageEnglish
Pages (from-to)6287-6294
Number of pages8
JournalGeophysical Research Letters
Volume42
Issue number15
Early online date13 Aug 2015
DOIs
Publication statusPublished - 16 Aug 2015

Keywords

  • zeta potential
  • surface charge
  • elevated temperatures
  • intact sandstones
  • potable water
  • seawater
  • pH

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