Organic compounds in bottom sediments of the Kolyma mouth area

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Abstract

The results of the study of chloroform bitumen (CB), organic carbon (Corg), aliphatic (ACHs) and polycyclic aromatic hydrocarbons (PAHs) in the bottom sediments of the Kolyma estuary showed that the sediments of the pier for small vessels in the village of Chersky, as well as in the port of Zeleny Mys, are the most polluted with oil products (according to IR spectra, composition of alkanes and PAHs). In 2018, the concentrations varied in the range: AHCs – 35–318 μg/g, PAH – 37–970 ng/g, weathered petroleum hydrocarbons dominated in the alkanes. In the sediments of the river itself and the Ambarchik Bay of the East Siberian Sea, the hydrocarbon concentrations were significantly lower: AHCs 71–25 μg/g, and PAHs – 28–100 ng/g), and terrigenous compounds of natural origin prevailed in their composition, and the Kolyma marginal filter copes with incoming pollutants. In subsequent years, the concentrations of hydrocarbons in port waters changed depending on the emissions of petroleum products.

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About the authors

I. A. Nemirovskaya

Shirshov Institute of Oceanology, Russian Academy of Sciences

Author for correspondence.
Email: nemir@ocean.ru
Russian Federation, Moscow

Y. S. Glyaznetsova

Federal Research Center “Yakutsk Science Center SB RAS,” Institute of Oil and Gas Problems, Siberian Branch, Russian Academy of Sciences

Email: glyaz1408@mail.ru
Russian Federation, Yakutsk

S. K. Gulev

Shirshov Institute of Oceanology, Russian Academy of Sciences

Email: gul@sail.msk.ru

Corresponding Member of the RAS

Russian Federation, Moscow

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Supplementary files

Supplementary Files
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2. Fig. 1. Sampling scheme in the mouth of the Kolyma river and the distribution of concentrations of AUV and PAH in the upper layer of bottom sediments in 2018 (the red rectangle marks Ambarchik Bay)

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3. Fig. 2. IR spectra of CB in the bottom sediments of the stations: H-7 (a); H-6 (b); P-3 (c) and precipitation of Ambarchik Bay (d) in 2018.

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4. 3. Composition of alkanes in bottom sediments: (a) in 2018, (b) in 2020, (c) in 2023; 1 – berth, village Chersky (station N-7), 2 – port Zeleny Cape (station N-6), 3 – village Petushki, 4 – integral sample of the Kolyma river from the village. Petushki to the mouth of the river (~45 km), 5 – Ambarchik Bay, 6 – port Zeleny Cape (station N-5)

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5. Fig. 4. Composition of PAHs of the surface layer of bottom sediments at individual stations: (a) stations N-7, P-7, K-3; (b) stations N-5, N-6, P-3

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