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Remediation of soil heavy metal by biochar has been extensively studied. However, few studies focused on the role of biochar on the co-immobilization of cadmium (Cd(II)) and arsenate (As(V)) and related soil nutrient availability. Remediation tests were conducted with three types of pristine and ferric trichloride (FeCl3) modified biochar (rice, wheat, and corn straw biochar) in Cd-As co-contaminated soil, with application rates of 1, 5, and 10% (w/w) and the incubation of 1, 7, 10, and 15 days. Using TCLP (Toxicity Characteristic Leaching Procedure) method, 10% of FeCl3 modified corn-straw derived biochar (FCB) had the highest immobilization efficiency of Cd(II) (63.21%) and As(V) (95.10%) after 10 days of the incubation. Iron-modified biochar immobilized higher fractions of water-soluble (F1) and surface-absorbed (F2) metal fractions than pristine biochar. For FCB amendment, Cd was mostly presented in the organic matter (OM) and sulfides associated (F4) and residual (F5) fractions (88.52%), as was found in the Fe-Al (oxides and hydroxides) (F3), F4, and F5 fractions (75.87%). FCB amendment increased soil pH values and available iron contents (p < 0.05), while no changes in soil available phosphorus content (p > 0.05). This study showed that FCB application reduces the environmental mobility of metals in Cd-As contaminated soil, while it also increases soil pH and available nutrient mobility, improving soil environmental quality and reducing remediation costs.
Yi-Min Wang; Shao-Wei Wang; Cheng-Qian Wang; Zhi-Yuan Zhang; Jia-Qi Zhang; Meng Meng; Ming Li; Minori Uchimiya; And Xu-Yin Yuan; Wang; Zhang. Simultaneous Immobilization of Soil Cd(II) and As(V) by Fe-Modified Biochar. International Journal of Environmental Research and Public Health 2020, 17, 827 .
AMA StyleYi-Min Wang, Shao-Wei Wang, Cheng-Qian Wang, Zhi-Yuan Zhang, Jia-Qi Zhang, Meng Meng, Ming Li, Minori Uchimiya, And Xu-Yin Yuan, Wang, Zhang. Simultaneous Immobilization of Soil Cd(II) and As(V) by Fe-Modified Biochar. International Journal of Environmental Research and Public Health. 2020; 17 (3):827.
Chicago/Turabian StyleYi-Min Wang; Shao-Wei Wang; Cheng-Qian Wang; Zhi-Yuan Zhang; Jia-Qi Zhang; Meng Meng; Ming Li; Minori Uchimiya; And Xu-Yin Yuan; Wang; Zhang. 2020. "Simultaneous Immobilization of Soil Cd(II) and As(V) by Fe-Modified Biochar." International Journal of Environmental Research and Public Health 17, no. 3: 827.
The environmental risk of potentially toxic metals in tailing soils is of universal concern. We conducted a 3-month pot experiment to research the distribution and variations of potentially toxic metals (PTMs), and the translocation and accumulation capability of these metals (Cr, Ni, Mn, Cu, Zu) in natural plants for three Fe/Mg tailing soils (serpentine-type, olivine-type and magnetite-type) with growth of a grass plant-Imperata cylindrica. We used comparative analysis, regression analysis and correlation analysis to process relevant experimental data. Results showed the rhizosphere tailing soils decreased from 3.70% to 16.8%, compared to the bulk soils, after growth of Imperata cylindrica, and the acid soluble fraction of Mn, Cu and Zn increased significantly. Cu and Zn were more bioavailable than other PTMs, especially for serpentine-type tailing soils. Linear regression analysis indicated that non-residual fractions showed different effects on metal concentrations of Imperata cylindrica. The non-residual metal fractions of serpentine-type and olivine-type tailing soils showed better correlations with metal concentrations in grass plants than those of magnetite-type tailing soils. We found that the chemical compositions of tailing soils showed remarkable effects on Ni and Mn compared with other elements, especially Mg and Al. Overall, the grass plant can alter the metal distribution, enhance metal bioavailability and promote land use of Fe/Mg tailing soils.
Xuyin Yuan; Yimin Wang; Doudou Tang; Xiaohui Zhang; Lei Zhang; Haiyan Zhang. Distribution and Phytoavailability of Potentially Toxic Metals in Different Fe/Mg Mine Tailings. International Journal of Environmental Research and Public Health 2018, 15, 2475 .
AMA StyleXuyin Yuan, Yimin Wang, Doudou Tang, Xiaohui Zhang, Lei Zhang, Haiyan Zhang. Distribution and Phytoavailability of Potentially Toxic Metals in Different Fe/Mg Mine Tailings. International Journal of Environmental Research and Public Health. 2018; 15 (11):2475.
Chicago/Turabian StyleXuyin Yuan; Yimin Wang; Doudou Tang; Xiaohui Zhang; Lei Zhang; Haiyan Zhang. 2018. "Distribution and Phytoavailability of Potentially Toxic Metals in Different Fe/Mg Mine Tailings." International Journal of Environmental Research and Public Health 15, no. 11: 2475.