scholarly journals Experimental determination of barite dissolution and precipitation rates as a function of temperature and aqueous fluid composition

2016 ◽  
Vol 194 ◽  
pp. 193-210 ◽  
Author(s):  
B.Y. Zhen-Wu ◽  
K. Dideriksen ◽  
J. Olsson ◽  
P.J. Raahauge ◽  
S.L.S. Stipp ◽  
...  
Keyword(s):  
Experimental Determination ◽  
Aqueous Fluid ◽  
Fluid Composition ◽  
Dissolution And Precipitation

The experimental determination of hydromagnesite precipitation rates at 22.5–75ºC

2014 ◽  
Vol 78 (6) ◽  
pp. 1405-1416 ◽  
Author(s):  
U.-N. Berninger ◽  
G. Jordan ◽  
J. Schott ◽  
E. H. Oelkers
Keyword(s):  
Low Temperature ◽  
Experimental Determination ◽  
Closed System ◽  
Equilibrium Constants ◽  
Magnesium Silicate ◽  
Silicate Mineral ◽  
Dissolution Rates ◽  
Dissolution And Precipitation

Natural hydromagnesite (Mg5(CO3)4(OH)2·4H2O) dissolution and precipitation experiments were performed in closed-system reactors as a function of temperature from 22.5 to 75ºC and at 8.6 < pH < 10.7. The equilibrium constants for the reaction Mg5(CO3)4(OH)2·4H2O + 6H+ = 5Mg2+ + 4HCO3– + 6H2O were determined by bracketing the final fluid compositions obtained from the dissolution and precipitation experiments. The resulting constants were found to be 1033.7±0.9, 1030.5±0.5 and 1026.5±0.5 at 22.5, 50 and 75ºC, respectively. Whereas dissolution rates were too fast to be determined from the experiments, precipitation rates were slower and quantified. The resulting BET surface areanormalized hydromagnesite precipitation rates increase by a factor of ~2 with pH decreasing from 10.7 to 8.6. Measured rates are approximately two orders of magnitude faster than corresponding forsterite dissolution rates, suggesting that the overall rates of the low-temperature carbonation of olivine are controlled by the relatively sluggish dissolution of the magnesium silicate mineral.

scholarly journals Experimental determination of Ni isotope fractionation during Ni adsorption from an aqueous fluid onto calcite surfaces

2020 ◽  
Vol 273 ◽  
pp. 26-36 ◽  
Author(s):  
Cristina Castillo Alvarez ◽  
Ghylaine Quitté ◽  
Jacques Schott ◽  
Eric H. Oelkers
Keyword(s):  
Experimental Determination ◽  
Isotope Fractionation ◽  
Aqueous Fluid

Experimental determination of a state equation for dissipative granular gases

1999 ◽  
Vol 96 (6) ◽  
pp. 1111-1116 ◽  
Author(s):  
E. Falcon ◽  
S. Fauve ◽  
C. Laroche
Keyword(s):  
Experimental Determination ◽  
State Equation ◽  
Granular Gases
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