Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow, Russia.
Institute of Oil and Gas Problems, Siberian Branch of the Russian Academy of Sciences, Yakutsk, Russia.
Mar Pollut Bull. 2024 Feb;199:115990. doi: 10.1016/j.marpolbul.2023.115990. Epub 2024 Jan 4.
One year after the emergency diesel fuel spill in Norilsk, hydrocarbon concentrations in bottom sediments of the Norilsk-Pyasina water system decreased. However the average concentrations of hydrocarbons in surface sediments decreased in the same sequence (μg/g) as in 2020: the mouth of the Ambarnaya R. (835, σ = 1788) > Bezymyanny Cr.-the Daldykan R.-the Ambarnaya R. (306, σ = 273) > the Pyasina R. (23, σ = 20) > the Pyasino Lake (12, σ = 8). Concentrations decreased due to degradation of low molecular weight hydrocarbons. The content of polycyclic aromatic hydrocarbons in 2021 also changed in a smaller range (0-1027 ng/g) than in 2020 (0-3865 ng/g). Petroleum origin of polycyclic aromatic hydrocarbons in the sediments of the Ambarnaya R. (including the mouth), Bezymyanny Cr. and the Daldykan R. is confirmed by the dominance of alkylated naphthalene homologues in their composition. Hydrocarbons accumulation in some layers of the sedimentary column is caused not only by the spill of diesel fuel, but also by the organic matter from the surrounding swamps, from wetlands and floodplain lakes, as well as by the burial of the surface layer by the 2021 flood.
在诺里尔斯克发生应急柴油燃料泄漏一年后，诺里尔斯克-皮雅西纳水系底部沉积物中的碳氢化合物浓度有所下降。然而，表层沉积物中碳氢化合物的平均浓度却呈现出与 2020 年相同的下降趋势（μg/g）：阿姆巴兰亚河河口（835，σ=1788）>别济缅溪-达尔达坎溪-阿姆巴兰亚河（306，σ=273）>皮雅西纳河（23，σ=20）>皮雅西纳湖（12，σ=8）。浓度的降低是由于低分子量碳氢化合物的降解所致。2021 年多环芳烃的含量也发生了变化，变化范围较小（0-1027ng/g），低于 2020 年（0-3865ng/g）。阿姆巴兰亚河（包括河口）、别济缅溪和达尔达坎溪沉积物中多环芳烃的石油来源，通过其组成中烷基萘同系物的优势得到了证实。一些沉积层中碳氢化合物的积累不仅是由于柴油燃料的泄漏，还与周围沼泽、湿地和洪泛区湖泊的有机物以及 2021 年洪水对表层的掩埋有关。
