کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6439203 1638061 2012 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mobilization and retardation of reduced manganese in sandy aquifers: Column experiments, modeling and implications
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
Mobilization and retardation of reduced manganese in sandy aquifers: Column experiments, modeling and implications
چکیده انگلیسی
The experimental data showed that adsorption of Mn2+ on the column solids was the main control on the Mn2+ breakthrough behavior. Nevertheless, up to 20% of the Mn that entered the experimental columns was precipitated as MnCO3. The rate of MnCO3 precipitation (kp = 0.04 h−1) was found to be ∼3 orders of magnitude slower than the rate of Mn2+ adsorption (ka = 10-200 h−1). Given the slow mineral-precipitation kinetics, the water flow rate is critical in determining the potential of MnCO3 precipitation in immobilizing Mn within an aquifer. A scale-up of the Mn retardation time found in the column experiments to natural aquifer conditions, suggests that adsorption is responsible for the prolonged retardation of Mn2+ observed in three different sandy aquifers. An important practical conclusion of this study is that the environmental response to perturbation in the hydro-geochemical regime of an aquifer might be delayed for several decades.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geochimica et Cosmochimica Acta - Volume 96, 1 November 2012, Pages 259-271
نویسندگان
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