Surface Waters of Yashkulsky District of Kalmykia: Current Chemical Composition
The paper analyzes the present-day chemical composition of key surface waters of Yashkulsky District. The hydrographical network of the district is constituted by minor lakes as follows: Bolshaya Saga, Nurin Khag, Kanurka, Deed Khulsun, Kek Nur, Buzga, Shorva, and Zerkalnoe. Mineral and chemical properties of water samples tested by Kalmytskaya Agrochemical Service Station with reference to the standard ГОСТ 26449.1-85: cation-anion structure revealed by the titration-based method, dry residues identified by gravimetry, pH tested by potentiometry. All the investigated water samples contain sulfate ions, chloride ions, and sodium ions; the highest rates of all three identified in Chernozemelsky Irrigation / Water Distribution System. As for ion composition, exceedance of established limits in sulfates and chlorides detected in the mentioned irrigation system, Kek Nur and Shorva Lakes; exceedance in sulfates only revealed in Kanurka and Deed Khulsun.