The determination of SO 4 2- , NaSO 4 - , and MgSO 4 0 tracer diffusion coefficients and their application to diagenetic flux calculations

Details The determination of SO 4 2- , NaSO 4 - , and MgSO 4 0 tracer diffusion coefficients and their application to diagenetic flux calculations The determination of SO 4 2- , NaSO 4 - , and MgSO 4 0 tracer diffusion coefficients and their application to diagenetic flux calculations

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48.2151a&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 48, Issue 10, pp.2151-2162

Physics

3

Scientific paper

Sulfur-35 was used to monitor the non-steady-state tracer diffusion of the free sulfate ion and sulfate ion-pairs in aqueous solutions of MgSO 4 and Na 2 SO 4 . Diffusion coefficients were derived from radiotracer flux measurements taken over ionic strengths ranging from 0.001 to 0.7. The experimental tracer diffusion coefficient is a function of the diffusion coefficients of the free sulfate ion and the sulfate ion-pairs as well as the ion pair equilibrium constant. The free sulfate ion tracer diffusion coefficient was determined independently from both the MgSO 4 and Na 2 SO 4 , experiments and found to be 1.11 and 1.08 (in units of 10 -5 cm 2 sec -1 , ± 10%, respectively. These values closely agree with that calculated from the Nernst expression, 1.07 sx 10 -5 cm 2 sec -1 . The tracer diffusion coefficients of MgSO 4 0 and NaSO 4 - were determined to be 0.85 and 1.23 sx 10 -5 cm 2 sec -1 , respectively. These numbers are in reasonable agreement with the earlier work on mutual diffusion coefficients by and (1979b) ( D MgSO 4 o = 0.65, D naso 4 - = 1.19) and Harned and Hudson (1951) D MgSO 4 0 = (0.70). A modified version of the theoretical equation developed by Pikal (1971) is proposed for predicting the tracer diffusion coefficients of many ion-pairs relevant to seawater. Many of these predicted values are found to be within 10-20% of the empirical values extracted from mutual diffusion data. The experimental and theoretical diffusion coefficient data are used to calculate revised coupled diffusion coefficients, D g , according to the model of Lasaga (1979).

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