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- W2493024150 abstract "Heterogeneous redox processes with mobile and immobile reactants can be significantly affected by transport processes in porous media. In this study, we have performed a sensitivity analysis on the effect of transport on the turnover of the reaction between H2S and FeOOH that is based on a surface complexation model implemented into a reactive transport code. The analysis considered two reactive surface species (≡FeS- and ≡FeSH), the amount of surface sites and the buffering capacity. Turnover depends on the ratio between residence time and characteristic reaction time, expressed as Da (Damköhler) numbers. Two completely different relationships between turnover and Da numbers were observed for the two reactive surface species which is due to the pH dependence of their speciation. Calibration of the kinetic model in a column experiment suggests the surface species ≡FeSH to be responsible for the turnover. The characteristic reaction time depends on the concentration of reactive surface sites and the amount of ferric(hydr)oxides. In natural systems, spatial distributions of these parameters exist along with that of residence times. We, therefore, postulate that Da numbers are also spatially distributed reflecting zones of high and low turnover with implications for product accumulation and competition with other reactions involving iron oxides." @default.
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- W2493024150 date "2011-01-01" @default.
- W2493024150 modified "2023-09-24" @default.
- W2493024150 title "The Role of Transport in Aquatic Redox Chemistry" @default.
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- W2493024150 doi "https://doi.org/10.1021/bk-2011-1071.ch025" @default.
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