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Rate equations for sodium catalyzed amorphous silica dissolution.
- Source :
-
Geochimica et Cosmochimica Acta . Dec2016, Vol. 195, p120-125. 6p. - Publication Year :
- 2016
-
Abstract
- Newly measured amorphous silica dissolution rate data were combined with data from the literature to produce an equation that predicts the dissolution flux ( J , mol/m 2 s) of amorphous silica as a function of temperature ( T , K), sodium concentration ( m Na+ , molal), and hydrogen ion activity ( a H+ ). J = 14.62 10 - 77400 2.303 R 1 T + 8.95 10 - 77700 2.303 R 1 T m Na + 0.490 a H + 0.377 The same data fit equally well to an equation that expresses the dissolution flux as a function of temperature, sodium concentration, and hydroxide ion activity ( a OH− ). J = 14.62 10 - 77400 2.303 R 1 T + 1.73 × 10 6 10 - 77700 2.303 R 1 T m Na + 0.490 a OH - 0.377 These equations have the same form as those for quartz ( Rimstidt, 2015 ) and show that sodium ions have the same catalytic effect on amorphous silica dissolution as they do for quartz. [ABSTRACT FROM AUTHOR]
- Subjects :
- *RATE equation model
*DISSOLUTION (Chemistry)
*SILICA
*HYDROGEN ions
*SODIUM ions
Subjects
Details
- Language :
- English
- ISSN :
- 00167037
- Volume :
- 195
- Database :
- Academic Search Index
- Journal :
- Geochimica et Cosmochimica Acta
- Publication Type :
- Academic Journal
- Accession number :
- 119341619
- Full Text :
- https://doi.org/10.1016/j.gca.2016.09.020