Affiliation:
1. Shirshov Institute of Oceanology, Russian Academy of Sciences
2. Institute of Oil and Gas Problems, Siberian Branch of the Russian Academy of Sciences
Abstract
One year after the emergency diesel fuel spill in Norilsk, hydrocarbon concentrations in bottom sediments of the Norilo-Pyasinsky water system decreased. But on average in the areas they 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) Pyasina R. (23, σ = 20) Lake Pyasino (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 hydrocarbons in the sediments of the Ambarnaya R. (including the mouth), Bezymyanny Cr. and Daldykan R. confirms the dominance of alkylated naphthalene homologues in their composition. Hydrocarbons accumulation in some horizons of the sedimentary strata is caused not only by seepage of diesel fuel, but also to the introduction of organic matter from the surrounding swamps from wetlands and floodplain lakes, as well as the burial of the surface layer by the 2021 flood.
Publisher
The Russian Academy of Sciences