کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4425022 1619206 2012 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Arsenic fractionation in mine spoils 10 years after aided phytostabilization
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Arsenic fractionation in mine spoils 10 years after aided phytostabilization
چکیده انگلیسی

Aided phytostabilization using a combination of compost, zerovalent iron grit and coal fly ash (CZA) amendments and revegetation effectively promoted the biological recovery of mining spoils generated at a gold mine in Portugal. Selective dissolution of spoil samples in combination with solid phase characterization using microbeam X-ray absorption near edge structure (μXANES) spectroscopy and microbeam X-ray fluorescence (μXRF) mapping were used to assess As associations in spoils ten years after CZA treatment. The results show that As preferentially associates with poorly crystalline Fe-oxyhydroxides as opposed to crystalline Fe-(oxyhydr)oxide phases. The crystalline Fe(III)-phases dominated in the treated spoil and exceeded those of the untreated spoil three-fold, but only 2.6–6.8% of total As was associated with this fraction. Correlation maps of As:Fe reveal that As in the CZA-treated spoils is primarily contained in surface coatings as precipitates and sorbates. Arsenic binding with poorly crystalline Fe-oxyhydroxides did not inhibit As uptake by plants.


► As:Fe ratio μXRF mapping demonstrates the formation of As in surface precipitates.
► Arsenic preferentially associates with poorly crystalline Fe-oxyhydroxides.
► Arsenic binding with Fe-oxyhydroxides did not inhibit its uptake by plants.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Environmental Pollution - Volume 166, July 2012, Pages 82–88
نویسندگان
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