کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5746163 1618791 2017 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Removal of toxic metals from vanadium-contaminated soils using a washing method: Reagent selection and parameter optimization
ترجمه فارسی عنوان
حذف فلزات سمی از خاک های آلوده به وانادیوم با استفاده از روش شستشو: انتخاب واکنش و بهینه سازی پارامتر
کلمات کلیدی
شستشو خاک، فلزات سمی، وانادیوم، تجزیه فلزات، واکنش دهنده های شستشو،
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
چکیده انگلیسی


- Soil washing technology was applied to treat V-contaminated soil.
- The V-forms were analyzed using the BCR three-step sequential extraction procedure.
- Citric acid, tartaric acid, oxalic acid, and Na2EDTA exhibited V-high removal rate.
- Concentration of reagents, liquid-to-solid ratio, and washing times were optimized.
- V removal mechanism of different washing reagents was discussed.

Vanadium (V) contamination in soils is an increasing worldwide concern facing human health and environmental conservation. The fractionation of a metal influences its mobility and biological toxicity. We analyzed the fractionations of V and several other metals using the BCR three-step sequential extraction procedure. Among methods for removing metal contamination, soil washing is an effective permanent treatment. We conducted experiments to select the proper reagents and to optimize extraction conditions. Citric acid, tartaric acid, oxalic acid, and Na2EDTA all exhibited high removal rates of the extractable state of V. With a liquid-to-solid ratio of 10, washing with 0.4 mol/L citric acid, 0.4 mol/L tartaric acid, 0.4 mol/L oxalic acid, and 0.12 mol/L Na2EDTA led to removal rates of 91%, 88%, 88%, and 61%, respectively. The effect of multiple washing on removal rate was also explored. According to the changes observed in metal fractionations, differences in removal rates among reagents is likely associated with their pKa value, pH in solution, and chemical structure. We concluded that treating with appropriate washing reagents under optimal conditions can greatly enhance the remediation of vanadium-contaminated soils.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 180, August 2017, Pages 295-301
نویسندگان
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