Programa de Pós-Graduação em Química, Universidade Federal Fluminense, Niterói, RJ, Brazil.
Núcleo de Biologia, Universidade Federal de Pernambuco, Vitória de Santo Antão, PE, Brazil; Departamento de Invertebrados, Museu Nacional, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.
Mar Pollut Bull. 2024 Oct;207:116821. doi: 10.1016/j.marpolbul.2024.116821. Epub 2024 Aug 14.
The chemical composition of spilt oils from events that took place on the north-eastern coast of Brazil in 2019 and 2022 was investigated to better understand their sources, and post-spill processes. Oils from both events originated from different sources, based on their fingerprints, hydrocarbons composition and specific biomarkers, such as the C23 tricyclic terpane and oleanane. Despite the differences, the source rocks share similarities in paleoenvironments and depositional conditions and both oils suffered little weathering, mainly due to evaporation and dissolution. Our findings for 2019 spilt oil reinforce that it is a mixed product, enriched both in lighter n-alkanes and 25-norhopanes. Differently, the 2022 samples exhibited characteristics of a non-processed crude oil that originated from a paraffinic deposit in storage tanks. The molecular composition and diagnostic ratios reported for samples from these spill events help to establish baselines for ongoing monitoring of oil spills in marine ecosystems.
研究了 2019 年和 2022 年发生在巴西东北海岸的事件中溢油的化学成分，以更好地了解它们的来源和溢油后的过程。基于指纹、碳氢化合物组成和特定生物标志物（如 C23 三环萜烷和齐墩果酸），这两起事件的溢油来自不同的来源。尽管存在差异，但源岩在古环境和沉积条件上具有相似性，而且这两种油类受风化影响较小，主要是由于蒸发和溶解。我们对 2019 年溢油的研究结果表明，它是一种混合产物，既富含较轻的正构烷烃，又富含 25-降藿烷。相比之下，2022 年的样品表现出未经处理的原油特征，源自储油罐中的石蜡沉积物。这些溢油事件样本的分子组成和诊断比有助于为海洋生态系统中正在进行的溢油监测建立基准。
