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首页> 外文期刊>Human and ecological risk assessment >Total and speciation analyses of heavy metals in the sand fraction of Nigerian oil sands for human and ecological risk assessment
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Total and speciation analyses of heavy metals in the sand fraction of Nigerian oil sands for human and ecological risk assessment

机译：尼日利亚油砂沙层中重金属的总量和形态分析，用于人类和生态风险评估

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摘要

Total metal analysis and metal speciation of sand fraction of Nigerian oil sands were done to extract and partition heavy metals into six operationally defined fractions in order to assess environmental and health implications of the oil sand development. Soxhlet extraction of bitumen from the oil sand was done using toluene. Traces of water and extracting solvent were removed at 70 degrees C from the sand fraction using oven. Elemental analysis was performed by Atomic Absorption Spectrophotometry. The heavy metals except Cu have low Pollution index values. Negative geo-accumulation index was obtained for the metals except Cu, indicating that the oil sands were uncontaminated with the metals. Strong and significant positive correlations existed between Fe/Pb, Zn/Cu, Cd/Pb, Ni/Cd, Ni/Pb, Cd/Fe, Ni/Fe and Cr/Zn, while strong and significant negative correlations existed between Mn/Pb and As/Mn, indicating common sources or chemical similarities and vice versa. T-test results indicated significant differences between the concentrations of the metals. Cross-plot analysis showed strong positive correlation between the sand fraction and Nigerian bitumen. Speciation analysis indicated highest and lowest indices of metal mobility for Zn and Pb, respectively. This study concluded that the sand fraction may not pose any environmental risks from elemental point of view.
机译：为了评估重油砂开发对环境和健康的影响，对尼日利亚油砂的沙子部分进行了全金属分析和金属形态分析，以将重金属提取和划分为六个可操作定义的部分。用甲苯从油砂中索氏提取沥青。使用烤箱在70摄氏度下从沙子级分中除去痕量的水和萃取溶剂。通过原子吸收分光光度法进行元素分析。除铜以外的重金属污染指数值低。除铜外，其他金属的地质累积指数均为负，表明油砂未受到金属的污染。 Fe / Pb，Zn / Cu，Cd / Pb，Ni / Cd，Ni / Pb，Cd / Fe，Ni / Fe和Cr / Zn之间存在强而显着的正相关，而Mn / Pb之间则存在强而显着的负相关。和As / Mn，表示常见来源或化学相似性，反之亦然。 T-检验结果表明金属浓度之间存在显着差异。交叉图分析显示，砂级分和尼日利亚沥青之间存在很强的正相关性。形态分析表明，锌和铅的金属迁移率分别为最高和最低。这项研究得出的结论是，从元素的角度来看，沙子部分可能不会构成任何环境风险。

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