Contamination Of Zeravshan River Water With Heavy Metals

Abstract

The research paper examines the long-term (1990-2019) changes in the amount of heavy metals in the water of the Zeravshan River as a result of anthropogenic impact on the river flow at all observation points. In addition, the pollution of the river with heavy metals was mapped using a geographic information system.

Pollution of the Zeravshan River with heavy metals is caused by industrial, agricultural and municipal wastewater, which is negatively affected by large volumes of wastewater from the cities of Samarkand and Navoi.

According to research, the amount of chromium (VI, III) along the Zeravshan River along the length of the river increased from 1990 to 2019, while the amount of copper, zinc, manganese, nickel, lead, cadmium and mercury decreased along the river. It is obvious that the effluents discharged by mining and processing enterprises located on the territory of Tajikistan also have an impact on the territory of Uzbekistan. Therefore, it is necessary to monitor the chemical composition of wastewater.