Abstract This study reports the fractionation of trace metals such as As, Bi, Cd, Co, Cr, Cu, Mo, Ni, Pb, Sb, Se, Tl and Zn in soils collected from Struibult gold mine dump, Gauteng, South Africa using a modified three-step BCR sequential extraction procedure. The extractable fractions such as exchangeable, easily reducible and oxidizable fractions were used assessed to the mobility and potential bioavailability of each investigated metal. Fractionation results revealed that As (55.4–80.6%), Bi (16.8–42.2%), Cr (83.3–94.8%), Cu (0–51.5%), Mo (0–80.4%), Ni (13.2–100%), Pb (55.6–79.6%), Sb (61.9–93.3%), Se (47.3–77.9%), Tl (58.8–100%) and Zn (8.7–100%) predominant metals in the residual fraction (F4) of soil samples. Individual contamination factors (ICF), geo-accumulation index (Igeo), contamination factor (CF), risk assessment code (RAC) and enrichment factor (EF) were used for assessment of the environmental impacts of trace metals in soil samples. The RAC and ICF values showed that Co, Ni and Zn have high environmental risk. The bioaccumulation of trace metals in the plants (Chrysopogon zizanioides) growing at the foot of the mine dump was assessed. Chrysopogon zizanioides was found to accumulate most of the studied metals that were available for uptake, with bioaccumulation factor (BAF>1). These results suggested that this plant species is a good accumulator for toxic metals in mining areas.

中文翻译：

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评估 Struibult 金矿垃圾场土壤中存在的痕量金属的流动性、分馏和潜在环境风险

摘要 本研究报告了从南非豪登省 Struibult 金矿垃圾场收集的土壤中痕量金属如 As、Bi、Cd、Co、Cr、Cu、Mo、Ni、Pb、Sb、Se、Tl 和 Zn 的分馏情况。修改后的三步 BCR 顺序提取程序。可提取的馏分，例如可交换的、易还原的和可氧化的馏分，用于评估每种研究金属的流动性和潜在的生物利用度。分馏结果显示 As (55.4–80.6%)、Bi (16.8–42.2%)、Cr (83.3–94.8%)、Cu (0–51.5%)、Mo (0–80.4%)、Ni (13.2–100%) )、Pb (55.6–79.6%)、Sb (61.9–93.3%)、Se (47.3–77.9%)、Tl (58.8–100%) 和 Zn (8.7–100%) 残余部分 (F4) 中的主要金属土壤样品。单个污染因子（ICF）、地质累积指数（Igeo）、污染因子（CF）、风险评估代码（RAC）和富集因子（EF）用于评估土壤样品中痕量金属的环境影响。RAC 和 ICF 值表明 Co、Ni 和 Zn 具有较高的环境风险。评估了在矿场脚下生长的植物 (Chrysopogon zizanioides) 中痕量金属的生物积累。发现 Chrysopogon zizanioides 积累了大部分可用于吸收的研究金属，具有生物积累因子 (BAF>1)。这些结果表明，该植物物种是矿区有毒金属的良好积累者。评估了在矿场脚下生长的植物 (Chrysopogon zizanioides) 中痕量金属的生物积累。发现 Chrysopogon zizanioides 积累了大部分可用于吸收的研究金属，具有生物积累因子 (BAF>1)。这些结果表明，该植物物种是矿区有毒金属的良好积累者。评估了在矿场脚下生长的植物 (Chrysopogon zizanioides) 中痕量金属的生物积累。发现 Chrysopogon zizanioides 积累了大部分可用于吸收的研究金属，具有生物积累因子 (BAF>1)。这些结果表明，该植物物种是矿区有毒金属的良好积累者。