Organic Matter and Petroleum Hydrocarbons in the Bottom Sediments of Coastal Waters of the Southern Kamchatka Peninsula
K. M. Zaripova1, K. I. Gurov2, ✉, E. A. Tikhonova1, O. V. Soloveva1
1 A. O. Kovalevsky Institute of Biology of the Southern Seas, Russian Academy of Sciences, Sevastopol, Russian Federation
2 Marine Hydrophysical Institute of RAS, Sevastopol, Russian Federation
✉ e-mail: gurovki@gmail.com
Abstract
Purpose. The purpose of the study is to assess the content and spatial distribution of organic matter and petroleum hydrocarbons in the surface layer of bottom sediments in the coastal waters of the southern Kamchatka Peninsula depending on the sediment grain-size composition and the degree of coastal urbanization.
Methods and Results. The surface (0–3 cm) sediment samples were collected by a box corer aboard the R/V Professor Multanovskiy in August–September 2023. The following parameters were determined: grain-size composition – by a combined sieve method, loss on ignition – according to GOST 23740-2016, organic carbon (Сorg) content – by coulometric analysis, and concentrations of chloroform-extractable substances and petroleum hydrocarbons – by gravimetric and IR spectrometry. The sediments consisted predominantly of silt-sand mixtures, with a higher silt content in the isolated bays. The content of Сorg ranged from 0.02 to 3.56%, and loss on ignition ranged from 0.86 to 9.87%, with a strong correlation between the indices (r = 0.91). The concentrations of petroleum hydrocarbons and chloroform-extractable substances ranged from 0.3 to 93 and 2 to 185 mg/100 g, respectively, with their maxima being observed in Avacha Bay. The minimum concentrations (0.3–3.2 mg/100 g for petroleum hydrocarbons and 2–8 mg/100 g for chloroform-extractable substances) were noted in sandy sediments in the Khalaktyrsky Beach area, as well as in silt sediments of Vilyuchinskaya Bay. The values of both of petroleum hydrocarbons and chloroform-extractable substances positively correlated with Сorg and loss on ignition. The linear regression model demonstrated that loss on ignition and the urbanization indicator jointly explained about 80% of the variation in ln(PHC).
Conclusions. The obtained results show that the organic matter content and the grain-size composition of sediments are the key factors controlling the accumulation of petroleum hydrocarbons, while coastal urbanization enhances the hydrocarbon load. Signs of chronic pollution are characteristic of Avacha Bay and several shallow bays.
Keywords
bottom sediments, grain-size composition, organic matter, organic carbon, petroleum hydrocarbons, marine pollution, urbanization, Kamchatka Peninsula, Avacha Bay
Acknowledgements
The study was carried out within the framework of the RSF project No. 25-27-00613 “Organic matter of bottom sediments of coastal water areas with different degrees of coastal urbanisation (Crimea Peninsula, Black Sea, Kamchatka Peninsula, Pacific Ocean, and Sea of Okhotsk)”. The authors are grateful to I.A. Zabegaev for his assistance with the analysis of the bottom sediment samples for organic carbon content.
About the authors
Ksenia M. Zaripova, Junior Researcher, A.O. Kovalevsky Institute of Biology of the Southern Seas, Russian Academy of Sciences (2 Nakhimov Ave., Sevastopol, 299011, Russian Federation) SPIN-code: 4535-0790, ORCID ID: 0009-0001-1160-4139, Scopus Author ID: 59173430600, ResearcherID: GWV-4575-2022, zaripova_km@ibss-ras.ru
Konstantin I. Gurov, Researcher, Marine Hydrophysical Institute of RAS (2 Kapitanskaya Str., Sevastopol, 299011, Russian Federation), CSc. (Geogr.), SPIN-code: 5962-7697, ORCID ID: 0000-0003-3460-9650, ResearcherID: L-7895-2017, gurovki@gmail.com
Elena A. Tikhonova, Leading Researcher, A.O. Kovalevsky Institute of Biology of the Southern Seas, Russian Academy of Sciences (2 Nakhimov Ave., Sevastopol, 299011, Russian Federation), CSc. (Biol.), SPIN-code: 3786-7334, ORCID ID: 0000-0002-9137-087X, Scopus Author ID: 57208495804, ResearcherID: X-8524-2019, tihonoval@mail.ru
Olga V. Soloveva, Leading Researcher, A.O. Kovalevsky Institute of Biology of the Southern Seas, Russian Academy of Sciences (2 Nakhimov Ave., Sevastopol, 299011, Russia), CSc. (Biol.), SPIN-code: 3114-7955, ORCID ID: 0000-0002-1283-4593, Scopus Author ID: 57416802600, ResearcherID: X-4793-2019, kozl_ya_oly@mail.ru
Original russian text
Original Russian Text © The Authors, 2026, published in MORSKOY GIDROFIZICHESKIY ZHURNAL, Vol. 42, Iss. 4, pp. 556–570 (2026)
For citation
Zaripova, K.M., Gurov, K.I., Tikhonova, E.A. and Soloveva, O.V., 2026. Organic Matter and Petroleum Hydrocarbons in the Bottom Sediments of Coastal Waters of the Southern Kamchatka Peninsula. Physical Oceanography, 33(4), pp. 584-597.
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