Polyaromatic Hydrocarbons in the Bottom Sediments of the Caspian Sea

D. Svetasheva, V. O. Tatarnikov, M. Ocheretny, O.I. Bakun
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Abstract

In this study, variations in the levels of oil hydrocarbons and polycyclic aromatic hydrocarbons (PAHs), which are persistent organic pollutants generated by human activities, were assessed in the bottom sediments of the Caspian Sea (Russia) sampled from 2012 to 2021. The samples were analyzed for their chemical composition. The concentrations of the identified compounds responsible for hydrocarbon pollution were established. The quantitative results of the industrial environmental monitoring in the Russian sector of the Caspian Sea for subsoil use were also reviewed and processed by standard statistical methods. It was revealed that ΣPAH concentrations in the Northern and Middle Caspian Sea regions vary from analytical zero to 186.7 μg/kg and from zero to 467.8 μg/kg, respectively. The scale of oil pollution in these two regions was found to be determined by the following PAHs: phenanthrene, acenaphthene, and naphthalene. The origin of the listed PAHs provides vital information on the main sources of pollution of the Caspian Sea bottom sediments with hazardous organic substances. Based on the obtained data, the areas with background PAH pollution of the bottom sediments and those with the characteristic PAH of mainly natural and pyrogenic origin were located.
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里海底部沉积物中的多芳烃
在这项研究中,研究人员评估了2012年至2021年里海(俄罗斯)海底沉积物中石油烃和多环芳烃(PAHs)水平的变化,这些污染物是人类活动产生的持久性有机污染物。对这些样品进行了化学成分分析。确定了已确定的烃污染化合物的浓度。还用标准统计方法审查和处理了里海俄罗斯段用于底土使用的工业环境监测的数量结果。结果表明,里海北部和中部地区的ΣPAH浓度变化范围分别为0 ~ 186.7 μg/kg和0 ~ 467.8 μg/kg。发现这两个地区的石油污染规模由以下多环芳烃决定:菲、苊和萘。所列多环芳烃的来源为里海海底沉积物中有害有机物质的主要污染源提供了重要信息。根据所获得的数据,确定了底泥多环芳烃本底污染区和以天然多环芳烃和热源多环芳烃为主的特征区。
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CiteScore
0.70
自引率
0.00%
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0
审稿时长
17 weeks
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