Ternary diffusion coefficients of the brine systems NaCl (0.5 M)-Na 2 SO 4 (0.5 M)-H 2 O and NaCl (0.489 M)-MgCl 2 (0.051 M)-H 2 O (seawater composition) at 25°C

Details Ternary diffusion coefficients of the brine systems NaCl (0.5 M)-Na 2 SO 4 (0.5 M)-H 2 O and NaCl (0.489 M)-MgCl 2 (0.051 M)-H 2 O (seawater composition) at 25°C Ternary diffusion coefficients of the brine systems NaCl (0.5 M)-Na 2 SO 4 (0.5 M)-H 2 O and NaCl (0.489 M)-MgCl 2 (0.051 M)-H 2 O (seawater composition) at 25°C

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50.2397m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 50, Issue 11, pp.2397-2403

Computer Science

Scientific paper

Mutual diffusion coefficients have been measured by Rayleigh interferometry for two ternary brine compositions at 25°C: NaCl (0.5 M)-Na 2 SO 4 (0.5 M)-H 2 O and NaCl (0.489 M)-MgCl 2 (0.051 M)H 2 O. The latter is a ternary analog of seawater. Four diffusion coefficients are required to characterize a ternary system. The data show that the cross term diffusion coefficients are significant, and cannot be neglected in accurate geochemical modeling. Since D 21 for NaCl-Na 2 SO 4 -H 2 O is negative, a sufficient gradient of NaCl can cause Na 2 SO 4 to move "uphill" against its own gradient. One of the cross term coefficients for NaClMgCl 2 -H 2 O is nearly as large as one of the main term coefficients.

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