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Enhanced marine monitoring and toxicity study of oil spill dispersants including Corexit EC9500A in the presence of diluted bitumen.
Journal of Environmental Science and Health, Part A ( IF 2.1 ) Pub Date : 2020-03-28 , DOI: 10.1080/10934529.2020.1744399
Pamela Brunswick 1 , Ceara Y MacInnis 1 , Jeffrey Yan 1 , Craig Buday 1 , Ben Fieldhouse 2 , Carl E Brown 2 , Graham van Aggelen 1 , Dayue Shang 1
Affiliation  

Observations made for the analysis of the oil spill dispersant tracer dioctyl sulfosuccinate (DOSS) during LC50 toxicity testing, highlighted a stability issue for this tracer compound in seawater. A liquid chromatography high-resolution quadrupole time-of-flight mass spectrometry (LC/QToF) was used to confirm monooctyl sulfosuccinate (MOSS) as the only significant DOSS breakdown product, and not the related isomer, 4-(2-ethylhexyl) 2-sulfobutanedioate. Combined analysis of DOSS and MOSS was shown to be applicable to monitoring of spill dispersants Corexit® EC9500A, Finasol OSR52, Slickgone NS, and Slickgone EW. The unassisted conversion of DOSS to MOSS occurred in all four oil spill dispersants solubilized in seawater, although differences were noted in the rate of MOSS formation. A marine microcosm study of Corexit EC9500A, the formulation most rapid to form MOSS, provided further evidence of the stoichiometric conversion of DOSS to MOSS under conditions relevant to real world dilbit spill. Results supported combined DOSS and MOSS analysis for the monitoring of spill dispersant in a marine environment, with a significant extension of sample collection time by 10 days or longer in cooler conditions. Implications of the unassisted formation of MOSS and combined DOSS:MOSS analysis are discussed in relation to improving dispersant LC50 toxicity studies.



中文翻译:

在稀释的沥青存在下,对包括Corexit EC9500A在内的溢油分散剂进行增强的海洋监测和毒性研究。

在LC50毒性测试过程中对溢油分散剂示踪剂磺基琥珀酸二辛基酯(DOSS)进行分析的观察结果突出了该示踪化合物在海水中的稳定性问题。液相色谱高分辨率四极杆飞行时间质谱(LC / QToF)用于确认磺基琥珀酸单辛酯(MOSS)是唯一的重要DOSS分解产物,而不是相关异构体4-(2-乙基己基)2 -磺基丁二酸。结果表明,DOSS和MOSS的组合分析可用于监测泄漏分散剂Corexit®EC9500A,Finasol OSR52,Slickgone NS和Slickgone EW。尽管在MOSS形成速率上存在差异,但溶解在海水中的所有四种溢油分散剂都发生了DOSS向MOSS的无助转化。对Corexit EC9500A的海洋微观研究,最迅速形成MOSS的配方,提供了在与现实世界中的Dilbit溢出相关的条件下,DOSS转化为MOSS的化学计量的进一步证据。结果支持DOSS和MOSS组合分析,以监测海洋环境中的溢出分散剂,在较冷的条件下,样品收集时间显着延长了10天或更长时间。讨论了无辅助形成MOSS以及结合DOSS:MOSS分析与改善分散剂LC50毒性研究的关系。在较凉的条件下,可将样品采集时间大大延长10天或更长时间。讨论了无辅助形成MOSS以及结合DOSS:MOSS分析与改善分散剂LC50毒性研究的关系。在较凉的条件下,可将样品采集时间大大延长10天或更长时间。讨论了无辅助形成MOSS以及结合DOSS:MOSS分析与改善分散剂LC50毒性研究的关系。

更新日期:2020-03-28
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