The kinetics of mineral dissolution in carbonate aquifers as a tool for hydrological investigations, II. Hydrogeochemical models

1977 ◽  
Vol 35 (3-4) ◽  
pp. 365-384 ◽  
Author(s):  
A. Mercado
Keyword(s):  
Mineral Dissolution ◽  
Carbonate Aquifers ◽  
Kinetics Of

Ion-specific effects on the kinetics of mineral dissolution

2011 ◽  
Vol 281 (3-4) ◽  
pp. 364-371 ◽  
Author(s):  
Encarnación Ruiz-Agudo ◽  
Maja Urosevic ◽  
Christine V. Putnis ◽  
Carlos Rodríguez-Navarro ◽  
Carolina Cardell ◽  
...  
Keyword(s):  
Mineral Dissolution ◽  
Specific Effects ◽  
Kinetics Of

scholarly journals Kinetics of carbonate mineral dissolution in CO2-acidified brines at storage reservoir conditions

2016 ◽  
Vol 192 ◽  
pp. 545-560 ◽  
Author(s):  
Cheng Peng ◽  
Benaiah U. Anabaraonye ◽  
John P. Crawshaw ◽  
Geoffrey C. Maitland ◽  
J. P. Martin Trusler
Keyword(s):  
Kinetic Model ◽  
Carbonic Acid ◽  
Dissolution Kinetics ◽  
Carbonate Reservoir ◽  
Mineral Dissolution ◽  
Direct Reaction ◽  
Carbonate Mineral ◽  
Dissolution Rates ◽  
Saturated Water ◽  
Kinetics Of

We report experimental measurements of the dissolution rate of several carbonate minerals in CO2-saturated water or brine at temperatures between 323 K and 373 K and at pressures up to 15 MPa. The dissolution kinetics of pure calcite were studied in CO2-saturated NaCl brines with molalities of up to 5 mol kg−1. The results of these experiments were found to depend only weakly on the brine molality and to conform reasonably well with a kinetic model involving two parallel first-order reactions: one involving reactions with protons and the other involving reaction with carbonic acid. The dissolution rates of dolomite and magnesite were studied in both aqueous HCl solution and in CO2-saturated water. For these minerals, the dissolution rates could be explained by a simpler kinetic model involving only direct reaction between protons and the mineral surface. Finally, the rates of dissolution of two carbonate-reservoir analogue minerals (Ketton limestone and North-Sea chalk) in CO2-saturated water were found to follow the same kinetics as found for pure calcite. Vertical scanning interferometry was used to study the surface morphology of unreacted and reacted samples. The results of the present study may find application in reactive-flow simulations of CO2-injection into carbonate-mineral saline aquifers.

Mineral Specific Biofilm Formation of “Acidibacillus ferrooxidans” Huett2

2017 ◽  
Vol 262 ◽  
pp. 334-338 ◽  
Author(s):  
Franziska Schieferbein ◽  
Matthias Bauer ◽  
Andreas Klingl ◽  
Simone Schopf
Keyword(s):  
Reaction Kinetics ◽  
Crucial Role ◽  
Biofilm Formation ◽  
Sulfide Minerals ◽  
Mineral Dissolution ◽  
Water Drainage ◽  
Drainage Ditch ◽  
Kinetics Of ◽  
Dissolution Of Minerals

Recently, a novel acidophilic heterotrophic iron oxidizing bacterium belonging to the newly described genus Acidibacillus (formerly Alicyclobacillus) was isolated from a water drainage ditch in Freiberg, Germany. Bioleaching tests showed that Acidibacillus ferrooxidans Huett2 contributes to the dissolution of minerals. As microbe-mineral interactions play a crucial role in nature and enhance the reaction kinetics of the mineral dissolution, attachment of Ab. ferrooxidans Huett2 on the sulfide minerals pyrite (FeS2), chalcopyrite (CuFeS2), and chalcocite (Cu2S) is in the focus of our current investigations.

scholarly journals Comparing Schwertmannite and Hydrobasaluminite Dissolution in Ammonium Oxalate (pH 3.0): Implications for Metal Speciation Studies by Sequential Extraction

Minerals ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 57 ◽  
Author(s):  
Javier Sánchez-España ◽  
Jesús Reyes
Keyword(s):  
Sequential Extraction ◽  
Toxic Elements ◽  
Mine Drainage ◽  
Metal Speciation ◽  
Ammonium Oxalate ◽  
Dissolution Kinetics ◽  
Mineral Dissolution ◽  
Mine Waters ◽  
Soils And Sediments ◽  
Kinetics Of

The “poorly crystalline iron oxy-hydroxides” are one of the most reactive and environmentally important fractions in soils and sediments due to the association of many toxic elements associated with these minerals. The metal content of this fraction in sequential extraction procedures is usually evaluated by dissolution in ammonium oxalate ([NH4]2C2O4·H2O) at pH 3.0 and 25 ᵒC [1–12]. Such chemical treatment, however, may also dissolve other mineral phases of comparable reactivity, which can lead to wrong interpretations of mineral carriers for specific metals. In this study, we compare the dissolution kinetics of schwertmannite and hydrobasaluminite, two minerals of comparable crystallinity and reactivity that play a major role in the mobility of many trace metals in waters and sediments affected by acid mine drainage (AMD). We first synthesized these two minerals in the laboratory by partial neutralization of two different metal-rich mine waters, and then we applied the standard protocol of ammonium oxalate dissolution to different specimens; the solutions were periodically sampled at intervals of 2, 5, 10, 15, 30 and 60 min to compare (i) the kinetics of mineral dissolution, and (ii) the metals released during dissolution of these two minerals. The results indicate a very similar kinetics of mineral dissolution, though hydrobasaluminite exhibited a faster rate. Some toxic elements such as As, Cr or V were clearly bonded to schwertmannite, while many others such as Cu, Zn, Si, Co, Ni and Y were clearly linked to hydrobasaluminite. These results suggest that studies linking the mobility of many elements with the Fe cycle in AMD-affected soils and sediments could be inaccurate, since these elements could actually be associated with Al minerals of poor crystallinity. The step of ammonium oxalate dissolution in sequential extraction studies should be best described with a more general term such as “low-crystallinity oxy-hydroxides”.

Sign in / Sign up

Export Citation Format

Share Document