Екологічне оцінювання стану поверхневих водойм Житомирського району на вміст хлоридів і сульфатів

Ecological assessment of the condition of surface water bodies of Zhytomyr district for the content of chlorides and sulfates was carried out. The research was conducted on the River Teteriv and its tributaries, reservoir Vidsichniy, from which water is taken for drinking water supply of Zhytomyr, below and above discharges of USC-1 and USC-2, the quarry of the silicate plant. A number of studies were conducted in 2017, 2018, and 2019. Surface water bodies are the most vulnerable sources of water as they are not protected from external influences and they are the first to take on all pollutants formed as a result of natural phenomenon and even more so as a result of human activities. In the legislation of Ukraine the content of sulfates and chlorides in surface water bodies is not regulated by any normative document, therefore water assessment was carried out equating its indicators to the standards of water intended for drinking water supply. Most of the subjects of centralized water supply of Zhytomyr district take water from surface reservoirs, and the City of Zhytomyr – directly from the River Teteriv. Water analyzes were carried out seasonally during the period of 2017-2019, as the value of the indicator is influenced by the temperature regime and volumes of water in rivers (filling). The highest content of both test agents was observed in summer and autumn, especially in the first half of the latter, when the water temperature was still well warmed. In addition, it is during this period that the lowest water content of the River Teteriv and its tributaries is observed, which in turn leads to an increase in the concentration of pollutants per unit volume. Places of selection seriously affected the content of the studied pollutants. The highest values of indicators were observed in the River Teteriv in the summer and autumn of 2017, below the discharge of USC-2, where water is discharged from the industrial zone. Although the accidences of the permissible values for both investigated pollutants were not detected according to DSanPIN 2.2.4-171-10 and DSTU 4808: 2007, but in some places of selection the content of chemical agents is of concern. In the dynamics of the studied years, the highest content of pollutants was observed in 2017. Seasonal dynamics indicates the greatest pollution in the warm season. This is especially true of the chloride content in the River Teteriv below the USC-2 discharges. Based on the obtained results, we can state that the condition of surface water bodies of Zhytomyr district can be considered satisfactory.