The speed of sound in mixtures of the major sea salts. A test of Young's rule for adiabatic PVT properties

F. J. Millero, C. A. Chen

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

The relative sound speed of mixtures of aqueous solutions of NaCl-MgSO4 and MgCl2-Na2SO4 at I=0.1 and 0.5m have been determined at 5, 15, and 25°C and pressures to 1000 bars. The resulting sound speeds, adiabatic and apparent molal compressibilities have been compared to results estimated from binary solutions using an additivity principle - Young's rule. The estimated sound speeds agree with the measured values for the NaCl-MgSO4 system to ±0.15 m-sec-1 and for the Na2SO4-MgCL2 system to ±0.20 m-sec-1. The deviations increase with increasing ionic strength (±0.08 m-sec-1 at I=0.1 and ±0.25 m-sec-1 at I=0.5 m). The sound speed of seawater have also been estimated from 0 to 40°C, 0.1 to 0.7 ionic strength and 0 to 1000 bars. The estimates were found to be in good agreement (±0.4 m-sec-1) with the measured values. These results indicate that reasonable estimates of the adiabatic PVT properties of dilute mixtures of electrolyte solutions can be made using the additivity principle, without excess mixing terms.

Original languageEnglish (US)
Pages (from-to)301-310
Number of pages10
JournalJournal of Solution Chemistry
Volume14
Issue number4
DOIs
StatePublished - Apr 1 1985

Keywords

  • MgCl
  • MgSO
  • NaCl
  • NaSO
  • Speed of sound
  • adiabatic properties
  • sea salts

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Physical and Theoretical Chemistry

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