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Monitoring chemical compositional changes of simulated spilled Brazilian oils under tropical climate conditions by multiple analytical techniques
Marine Pollution Bulletin ( IF 5.8 ) Pub Date : 2021-01-20 , DOI: 10.1016/j.marpolbul.2021.111985
Bárbara D. Lima , Laercio L. Martins , Eliane S. de Souza , Marcos A. Pudenzi , Georgiana F. da Cruz

To comprehensively understand the chemical changes over time of spilled oils subject to tropical climate conditions and the active weathering processes, a spill simulation experiment was conducted along 210 days with two distinct Brazilian oils (19 and 24 API) under irradiation and non-irradiation of sunlight. Isoprenoids and n-alkanes showed a great loss after 40 days for both oils under the two conditions due to evaporation. Diagnostic ratios of saturated biomarkers showed no changes, whereas the polycyclic aromatic hydrocarbons had a decreasing concentration under both conditions mainly due to evaporation. Furthermore, oxygenated polar compounds produced by photooxidation were investigated by ESI(−) FT-ICR MS and showed changes only for the oils exposed to sunlight irradiation. Based on the observed polar compositional changes, new parameters are suggested using heteroatom classes to estimate oil spill time under tropical conditions: NO3/NO2; NO3/(NO + NO2); ∑NOx/N1; (O4 + O3)/(O2 + O1); O4/(O2 + O1); and O3/O2.



中文翻译:

通过多种分析技术监测热带气候条件下模拟泄漏的巴西石油的化学成分变化

为了全面了解受热带气候条件和活跃的风化作用影响的溢油随时间变化的化学变化,在210天下使用两种不同的巴西油(19和24 API)在阳光和非阳光照射下进行了溢油模拟实验。类异戊二烯和n在两种条件下,由于蒸发,两种油在40天后,β-烷烃均损失巨大。饱和生物标志物的诊断率没有变化,而多环芳烃在两种条件下的浓度均下降,这主要是由于蒸发。此外,通过ESI(-)FT-ICR MS对光氧化产生的氧化极性化合物进行了研究,结果显示仅对暴露在阳光下的油会有变化。根据观测到的极性组成变化,建议使用杂原子类别估算热带条件下的溢油时间的新参数:NO 3 / NO 2;NO 3 /(NO + NO 2); ∑NO x / N 1;(O 4  + O3)/(O 2  + O 1); O 4 /(O 2  + O 1); 和O 3 / O 2

更新日期:2021-01-20
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