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DOI: 10.31862/2500-2961-2022-12-4-397-417

Assessment of the content of heavy metals in recreational water bodies in Dzerzhinsky town (Moscow agglomeration) during 2006–2020

The article is devoted to monitoring the state of recreational water bodies in Dzerzhinsky town (Moscow agglomeration). Studies of water bodies were carried out in 2006, 2017 and 2020. Laboratory analysis for the content of gross forms of heavy metals was carried out in the same laboratory using uniform methods, which allows for a comparative analysis of the content of heavy metals in these water bodies for the period from 2006 to 2020. In 2020, there is a decrease in the concentrations of heavy metals such as Pb, Cd, Fe and Mn compared to 2006. So, the content of cadmium in 2020 was 0.006–0.017 mg/l compared with the data of 2006, when the concentration was 0.022–0.028 mg/l. The content of iron and manganese also decreased in 2020 compared to 2006. So, the iron content fluctuated between
0.5–1.2 MPC in 2020 (compared to 0.9–2.6 MPC in 2017 and 0.4–2.4 MPC in 2006). Manganese content in water bodies varied by 0.3–2.4 MPC, while in 2017 and 2006 the values were 0.7–3.6 MPC and 4.6–21.7 MPC, respectively. As to lead, with the exception of point 1 (the Moskva River behind the monastery), there is a decrease in Pb concentrations in 2020 by 3–4 times compared to 2006. In general, in 2020, there is a trend towards a decrease in HM concentrations in the water bodies of the town of Dzerzhinsky, which is presumably due to the COVID-19 restrictions. However, despite the trend towards improvement, all urban water bodies still experience significant anthropogenic impact and are heavily polluted with heavy metals.

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