Lculated for the water of Lake Peipus (45 with the lake region
Lculated for the water of Lake Peipus (45 in the lake location belongs to Russia, 55 to Estonia). This lake is exposed for the anthropogenic load from point (urban wastewater) and scattered (agricultural facilities) sources of pollution. WPIreg for this lake was 0.77, which corresponds towards the category of clean waters [45]. four. Conclusions The results from the research showed the significant influence from the urban atmosphere on the chemical composition with the Murmansk lakes. Probably the most polluted lake was Lake Ledovoe with all the highest concentrations of V, Cr, Co, Ni, Cu, W, and Mn. The least topic to anthropogenic load was Lake Yuzhnoe, characterized by the lowest concentrations of studied heavy metals. The highest excess on the background within the Murmansk lakes had been located for V, Ni, Zn, Fe, and Mn. The key reason for the higher content of V and Ni is the combustion of mazut fuel. Zn and Mn concentrations can increase because of each all-natural and anthropogenic factors, influencing different processes in the surface and DNGR-1/CLEC9A Proteins Biological Activity bottom waters. The evaluation in the seasonal variation showed that the highest concentrations of heavy metals have been observed in winter/spring season and reached their maximum throughout theWater 2021, 13,11 ofperiod of melt water intake in the catchment location. The assessment in the good quality from the Murmansk lakes applying the regional water pollution index showed that Ledovoe, Okunevoe, and Srednee lakes is often characterized as “heavily polluted”. Semenovskoe, Severnoe, and Treugolnoe lakes are “polluted”. Only Lake Yuzhnoe is “moderately polluted”.Author Contributions: Conceptualization, M.A.P., V.A.D. and Z.I.S.; methodology, M.A.P. and D.S.B.; application, M.A.P.; validation, V.A.D. and Z.I.S.; investigation and sources, Z.I.S., V.A.D., M.A.P. and D.S.B.; information curation, Z.I.S.; writing–original draft preparation, M.A.P.; writing–review and editing, Z.I.S. and V.A.D.; visualization, M.A.P. and Z.I.S.; supervision, V.A.D.; project administration and funding acquisition, Z.I.S. All Carboxypeptidase A2 Proteins Gene ID authors have study and agreed towards the published version on the manuscript. Funding: The research is supported by the Grant with the Russian Science Foundation, project No. 19-77-10007 (the seasonal dynamics of heavy metal pollution), the Grant from the Government of Murmansk area 224 (the environmental assessment with the situation of urban lakes), along with the State order of laboratory of geoecology and environmental management from the Arctic of INEP KSC RAS No. 1021111018324-1 (comparing pollutant concentrations with all the background). Acknowledgments: The authors sincerely thank the colleagues from Apatity: D.B. Denisov as well as a.A. Cherepanov for the help with sampling, A.A. Cherepanov for building the study location map, and I.R. Elizarova for the high-quality analytical studies. On top of that, the authors sincerely thank D.A. Tikhonova for translating the report to English. Conflicts of Interest: The authors declare no conflict of interest.
Received: 24 October 2021 Accepted: 15 November 2021 Published: 18 NovemberPublisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.Copyright: 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access short article distributed beneath the terms and circumstances in the Inventive Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/).Access to secure drinking-water, sanitation and hygiene is basic to human well being and well-being at the same time.
