Arsenopyrite (FeAsS(s)) and arsenian pyrite are the most common naturally occurring forms of arsenic in sedimentary rock formations. Dissolution of arsenic from sedimentary formations upon contact with CO2-saturated brine may pose risk of environmental impacts to overlying aquifers. Preliminary U.S. Department of Energy studies of mineral dissolution from such formations in contact with CO2 saturated brine have indicated potential for arsenic release in concentrations of concern. This study aims to measure the maximum rate of arsenopyrite dissolution into simulated brine solutions at CO2 sequestration conditions i.e. temperatures from 25 to 160 �C and pressures up-to 300 bars. A small scale flow-through column system was designed for this purpose. The reactor consists of a 10 cm HPLC column packed with arsenopyrite particles of size 180-250 �m. Pressure and temperature of the system are maintained constant and effluent arsenic concentration is analyzed to determine the dissolution rate.

Investigation of arsenopyrite dissolution kinetics using a flow-through mini-column system

243rd National Meeting (2012)

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