Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6335091 | Applied Geochemistry | 2014 | 37 Pages |
Abstract
FeS2+7/2O2(aq)+H2OâFe2++2SO42-+2H+,where the rate law for the reaction at pH = 4.2-5.6 and T = 25 °C was determined to be Rsp = 10â8.42±0.06 [O2]0.5 (mol mâ2 sâ1). This result is consistent with the reaction rate of pyrite grains with dissolved oxygen reported by previous researchers. Hydraulic conductivity decreased by approximately 12.5% during the nitrogen-inflow stage and by 69% during the oxygen-inflow stage. This change can be attributed to the oxidizing reaction within the rock and to the probable clogging of fine weathering products in the pore space. The geochemical modeling of the experimental outflowing water and seepage samples from the field using the PHREEQC program suggested that pore water develops into an acidic solution rich in iron and sulfate due to long-term pyrite oxidation and evaporation.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Geochemistry and Petrology
Authors
Xin Liao, Masahiro Chigira, Yuki Matsushi, Xiyong Wu,