CHANGES IN THE ION-SALT COMPOSITION OF THE SHU RIVER WATER (KAZAKHSTAN PART) IN THE LONG-TERM CYCLE

Abstract

The materials of a study of the ion-salt composition of water along the Shu River in the village of Kainar and village of Konaeva, Zhambyl region, over a long-term period (2014...2023) are presented. It was found that the ionic composition of the water in the upper section of the Shu River (Kainar village) was characterized by a relatively stable bicarbonate-calcium composition. due to their leaching from carbonate rocks common in the drainage basin. The hypothetical salt composition of the water of the Shu River (Kainar village) is represented by six salts: Ca(HCO₃)₂ (22,1...59.2), MgSO₄ (6,7...41,1), Na₂SO₄ (0,8...55,4), NaCl (3,3...17,9), Mg (HCO₃)₂ (0,0...16,5) and CaSO₄ (0,0...10,2 % equivalents of the total amount of salts). The limits of changes in the total salinity of the Shu River (Konaeva village) in 2019...2023 were 447,2...897,8 mg/dm³, which exceeds its maximum values for the same years in Kainar village by 38,5...282,5 mg/dm³. The water here is more often slightly alkaline of medium hardness. The ionic composition is dominated by sulfate and calcium or sodium ions. In addition to the above salts, magnesium chloride appears in the salt composition of the Shu River (Konaeva village), which led to the processes of metamorphosis in the forward direction. When using Shu water for irrigation or for technical purposes, the formation of solid salts of calcium carbonate and calcium sulfate is possible. For brackish soils, such as those of the river basin, such salts will have a reclamation effect, and when heated, the precipitation of calcium carbonates and sulfates in technical equipment is very likely to intensify.

Keywords: ionic and salt composition, mineralization, hardness, hydrochemistry, ecology