Water Quality Monitoring of the Chirchik River Basin, Uzbekistan
摘要
The study investigates occurrence of ionic contaminants and pollutants in the tributaries of the Chirchik River in the northeast part of Uzbekistan. Water samples collected in the Chirchik River Basin were analyzed by ion liquid chromatography to determine ions such as Ca, Mg, K, NH4, Na, Li, SO4, NO3, Br, NO2, Cl, F, PO4. Plant available forms of heavy metals in soils were extracted according to the methods established by Japanese Ministry of Environment. Elements such as Cr, Ni, Cu, Zn, V, Mn, Fe, Ga, Ba, As, Mo, Rb, Sr, Sb, Se, Cd, In, Cs, Co, Ag, Hg, Tl, Pb were detected with the help of ICP-MS. Toxic heavy metals such as Hg, Cd and Pb were not detected in all water samples, while Fe and Ba exceeded the Maximum Admissible Concentrations (MAC) in several sites in the watershed. Contaminants such as NO3, NO2, SO4, NH4 and PO4 exceeded the MAC values for some water samples probably due to discharges from agriculture and other industries. It was noticed that the level of most ions increased near to stationary sources, automobile road and residential area while the concentrations of As and Sb were initially high in the Charvak water reservoir.