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
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
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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 hâ1) was found to be â¼3 orders of magnitude slower than the rate of Mn2+ adsorption (ka = 10-200 hâ1). 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
Journal: Geochimica et Cosmochimica Acta - Volume 96, 1 November 2012, Pages 259-271
نویسندگان
Orly Goren, Boaz Lazar, Avihu Burg, Ittai Gavrieli,