کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4574263 1629514 2011 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sorption and mobility of Sb(V) in calcareous soils of Catalonia (NE Spain): Batch and column experiments
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Sorption and mobility of Sb(V) in calcareous soils of Catalonia (NE Spain): Batch and column experiments
چکیده انگلیسی

The sorption of Sb(V) onto natural calcareous soils was studied in batch and column experiments as a function of physicochemical properties of the soil, namely: organic matter, the active fraction of Fe and Al and the pH of the soils. Batch experiments were performed in order to determine the sorption capacity and the kinetic rate of the sorption. Freundlich isotherm described properly the equilibrium experimental data and the kinetic results show that the sorption was very slow in all the soils studied (equilibrium after 7 days) when compared with literature data for Sb(V) sorption onto soils with higher iron content. Column experiments were carried out in order to determine the mobility of Sb(V) in the soils. The Thomas model can describe partially the breakthrough curves obtained for the Sb(V) sorption on the soils. The fitting of the model to the experimental data would indicate that transport and kinetic parameters also affected the dynamic sorption behavior. The experimental breakthrough curves can be properly described by the convective–dispersive equation (CDE) by using the CXTFIT code, and the parameters obtained by the model were in concordance to the sorption capacity reported in the column experiments. This study indicates that sorption of Sb(V) onto the soils is mainly affected in batch experiments by their ‘active’ Fe and Al content; while in column experiments organic matter content appeared as an important parameter. Desorption experiments resulted in a metalloid recovery above 90%, which indicates a fast and effective method to recover Sb(V) from calcareous soils and has implications for its geochemical behavior (vertical mobility in soil profiles) as a result of its relatively low Sb retention.

Research Highlights
► In general, this study indicates that sorption of Sb(V) onto the soils is mainly affected in batch experiments by their ‘active’ Fe and Al content; while in column experiments organic matter content appeared as an important parameter.
► The results indicate that Sb(V) sorption onto the calcareous soils is slow, the equilibrium is reached in general in seven days. These equilibrium times contrast with the sorption onto other soils (e.g. soils with a relatively high Fe-content), in which equilibrium is reached in less than one day.
► The equilibrium results show a positive correlation (higher sorption capacity of the soils for Sb(V)) between the Freundlich distribution coefficient and content of Fe and Al and the sum of Fe+Al.
► The desorption experiments reported a metal recovery above of 90% indicating a faster and effective method to recover Sb(V) from soils. These results indicate the relatively low Sb retention in calcareous soils and indicate a vertical mobility in soil profiles.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geoderma - Volume 160, Issues 3–4, 15 January 2011, Pages 468–476
نویسندگان
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