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Aquatic Geochemistry

, Volume 24, Issue 2, pp 107–119 | Cite as

Galena Non-oxidative Dissolution Kinetics in Seawater

  • Rodrigo F. EmbileJr.
  • Ingar Walder
Original Article
  • 65 Downloads

Abstract

The rate of non-oxidative galena dissolution in seawater compositions over the pH range of 2–4.5 was determined from batch reactor experiments. The derivative at zero time of a polynomial fit of the Pb concentration versus time data for the first 30 min was used to determine the rate. A plot of RGn (rate of galena dissolution) versus pH for data from six experiments is linear (R2 = 0.96), with a slope of 0.5. The rate equation describing the rate of galena dissolution as a function of hydrogen ion activity is
$$R_{\text{Gn}} = - \,10^{ - 10.72} \left( {a_{{{\text{H}}^{ + } }} } \right)^{0.50}$$
Varying the concentration of dissolved oxygen produced no significant effect on the measured rates. The activation energy, based on four experiments carried out over the temperature range of 7–30 °C, is 61.1 kJ/mol.

Keywords

Galena Reaction rate Seawater 

Notes

Acknowledgements

The authors would like to extend their gratitude to Dr. Michael McKibben of UC Riverside for allowing us to use their experimental setup as well as for his advice and expertise during the manuscript review process. Special thanks are also extended to Taylor van Hoorebeke, Natalie Alsalek and Camilo Uribe Mogollon for their assistance during the experimental setup and sampling. Gratitude is likewise extended to the New Mexico Bureau of Geology for the use of their analytical instruments used in this study. This study was funded through the Research Council of Norway Project No. 241879 in cooperation with the Kjeøy Research and Education Center.

Supplementary material

10498_2018_9335_MOESM1_ESM.xlsx (29 kb)
Supplementary material 1 (XLSX 28 kb)

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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  1. 1.New Mexico Institute of Mining and TechnologySocorroUSA
  2. 2.Kjeøy Research and Education CenterVestbygdNorway

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