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首页> 外文期刊>Ecotoxicology and Environmental Safety >Assessing the bioremediation potential of algal species indigenous to oil sands process-affected waters on mixtures of oil sands acid extractable organics
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Assessing the bioremediation potential of algal species indigenous to oil sands process-affected waters on mixtures of oil sands acid extractable organics

机译：评估油砂过程中受水影响的藻类物种对油砂酸可萃取有机物混合物的生物修复潜力

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Surface mining extraction of bitumen from oil sand in Alberta, Canada results in the accumulation of oil sands process-affected water (OSPW). In attempts to maximize water recycling, and because its constituents are recognized as being toxic, OSPW is retained in settling basins. Consequently, research efforts are currently focused on developing remediation strategies capable of detoxifying OSPW to allow for eventual release. One potential bioremediation strategy proposes to utilize phytoplankton native to the Alberta oil sand region to sequester, break down, or modify the complex oil sands acid extractable organic (AEO) mixtures in OSPW. Preliminary attempts to quantify changes in total oil sands AEO concentration in test solutions by ESI-MS following a 14-day algal remediation period revealed the presence of unknown organic acids in control samples, likely released by the phytoplankton strains and often of the same atomic mass range as the oil sands AEO under investigation. To address the presence of these "biogenic" organic acids in test samples, ESI-MS in MRM mode was utilized to identify oil sands AEO "marker ions" that were a) present within the tested oil sands AEO extract and b) unique to the oil sands AEO extract only (e.g. atomic masses different from biogenic organic acids). Using this approach, one of the 21 tested algal strains, Stichococcus sp. 1, proved capable of significantly reducing the AEO marker ion concentration at test concentrations of 10, 30, and 100 mg L-1. This result, along with the accelerated growth rate and recalcitrance of this algal strain with exposure to oil sands AEO, suggests the strong potential for the use of the isolated Stichococcus sp. 1 as a candidate for bioremediation strategies. (C) 2016 Elsevier Inc. All rights reserved.
机译：从加拿大艾伯塔省的油砂地面开采沥青中提取沥青会导致油砂受到过程影响水（OSPW）的积累。为了最大程度地实现水的循环利用，并且由于其成分被认为具有毒性，OSPW被保留在沉淀池中。因此，目前的研究工作集中在开发能够使OSPW排毒以最终释放的补救策略。一种潜在的生物修复策略提议利用亚伯达省油砂地区的原生浮游植物来隔离，分解或修饰OSPW中复杂的油砂可酸提取的有机（AEO）混合物。经过14天的藻类修复期后，通过ESI-MS定量测试溶液中总油砂AEO浓度的初步尝试表明，对照样品中存在未知有机酸，可能是浮游植物菌株释放的，并且通常具有相同的原子质量范围为被调查的油砂AEO。为了解决测试样品中这些“生物”有机酸的存在，利用MRM模式的ESI-MS来识别油砂AEO“标记离子”，它们是a）存在于测试油砂AEO提取物中的，b）唯一的。油砂仅是AEO提取物（例如，原子质量不同于生物有机酸）。使用这种方法，测试了21种藻类菌株之一Stichococcus sp.。如图1所示，证明能够在10、30和100 mg L-1的测试浓度下显着降低AEO标记离子浓度。该结果，以及该藻株在油砂AEO中暴露后的加速生长速度和顽固性，表明使用分离的Stichococcus sp的巨大潜力。 1作为生物修复策略的候选人。 （C）2016 Elsevier Inc.保留所有权利。

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