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首页> 外文期刊>Environmental Science & Technology >Vanadium Geochemistry of Oil Sands Fluid Petroleum Coke
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Vanadium Geochemistry of Oil Sands Fluid Petroleum Coke

机译：油砂流体石油焦的钒地球化学

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摘要

Vanadium has previously been linked to elevated toxicity of leachates derived from oil sands petroleum coke. However, geochemical controls on V mobility within coke deposits remain poorly constrained. Detailed examinations of porewater and solid-phase V geochemistry were therefore performed on oil sands fluid petroleum coke deposits in Alberta, Canada. Sample collection focused on both active and reclaimed deposits, which contained more than 3 × 10~7m~3 of fluid petroleum coke. Dissolved V concentrations were highest (up to 3.0 mg L~(-1)) immediately below the water table but decreased rapidly with increasing depth. This trend corresponded to a transition from mildly acidic (pH 6-7) and oxic conditions to mildly alkaline (pH 7-8.5) and anoxic conditions. Scanning electron microscopy (SEM), electron microprobe analysis (EMPA), and micro-X-ray fluorescence (μXRF) mapping revealed coke particles exhibited an internal structure characterized by successive concentric layers. The outer margins of these layers were characterized by elevated V, Fe, Si, and A1 concentrations, indicating the presence of inorganic phases. Micro-X-ray absorption near-edge structure (μXANES) spectroscopy revealed that V speciation was dominated by V(IV) porphyrins except at outer margins of layers, where octahedrally coordinated V(Ⅲ) was a major component. Minor to trace V(V) was also detected within fluid petroleum coke particles.
机译：钒以前被认为与油砂石油焦中沥滤液的毒性增加有关。但是，对焦炭沉积物中V迁移率的地球化学控制仍然很难得到约束。因此，对加拿大艾伯塔省的油砂流体石油焦沉积物进行了孔隙水和固相V地球化学的详细检查。样品采集集中于活性和再生矿床，其中含有3×10〜7m〜3以上的液态石油焦。紧接在地下水位以下的溶解态V浓度最高（最高3.0 mg L〜（-1）），但随着深度的增加而迅速降低。这种趋势对应于从弱酸性（pH 6-7）和有氧条件到弱碱性（pH 7-8.5）和缺氧条件的转变。扫描电子显微镜（SEM），电子微探针分析（EMPA）和微X射线荧光（μXRF）测绘表明，焦炭颗粒表现出以连续同心层为特征的内部结构。这些层的外边缘的特征是V，Fe，Si和Al浓度升高，表明存在无机相。显微X射线吸收近边缘结构（μXANES）光谱表明，V形态主要由V（IV）卟啉占据，除了在层的外边缘处，八面体配位的V（Ⅲ）是主要成分。在液态石油焦颗粒中也检测到微量V（V）。

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  • 来源
    《Environmental Science & Technology》 |2017年第5期|3102-3109|共8页
  • 作者

    Jake A. Nesbitt; Matthew B. J. Lindsay;

  • 作者单位

    Department of Geological Sciences, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada;

    Department of Geological Sciences, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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