PETROLEUM COMPONENTS IN WATER AND BOTTOM SEDIMENTS OF THE TEMERNIK RIVER

Along the Temernik River within the city of Rostov-on-Don, a high level of contamination with petroleum products and polycyclic aromatic hydrocarbons was noted in the water and bottom sediments. The most polluted sections of the river are in the area of the “Temernik” market, the Zmievskaya Hollow, the Botanical Garden of the Southern Federal University, the bus station and the mouth of the Temernik River. Excess of the MPC of petroleum products was detected in more than 80% of the analyzed water samples. The multiplicity of the maximum permissible concentration in water varied from 0.4 to 82.8 times. In the vast majority of the analyzed water samples of the Temernik River, the results of the luminescent method were 1.3‒13 times higher than the results of the infrared method, which indicates the accumulation of luminescent polycyclic aromatic hydrocarbons resistant to degradation processes. The obtained data indicate the chronic nature of oil pollution of the Temernik River water in the area from the Temernik market to the mouth. In the bottom sediments of the river, the concentrations of petroleum products varied from hundredths – 0.04 g/kg to abnormally high values ‒ 200 g/kg of dry weight. According to the averaged data obtained in various seasons 2018‒2020, according to the increase in oil pollution of bottom sediments, the Temernik River sections are arranged in the following order: Rostov reservoir, Upper reservoir, Upper reservoir 2, Kamyshevakha, Lower reservoir, Surb Khach, bus station, “Temernik” market, Zmievskaya beam, Botanical Garden, estuary. The concentrations of the amount of polycyclic aromatic hydrocarbons in the water of various sections of the Temernik River varied in the range of 91.6‒505.6 ng/l, in bottom sediments – 277.6‒2939 micrograms/kg of dry weight. The maximum concentrations of polycyclic aromatic hydrocarbons in water and in bottom sediments were found in the area of the bus station. The excess of the maximum permissible concentration of naphthalene (4000 ng/l) and benz(a)pyrene (10 ng/l) was not detected in the water samples studied. Naphthalene dominated in the composition of polycyclic aromatic hydrocarbons in water, fluoranthene dominated in bottom sediments.

Temernik River, water, bottom sediments, pollution, petroleum products, polycyclic aromatic hydrocarbons