Scholarlink

Abstract <p>The elemental composition of the Sochi River waters varies sharply with the change of phases of the water regime. During the flood period it is quite rich, during the low water period it is comparatively poor. During the flood period, the river waters are enriched with 19 chemical elements relative to their average concentrations in river water of the continents (Clarkes), and during the low water period, with only 7. The total contents of excess chemical elements in different phases of the water regime, on the contrary, are higher during the low-water period due to the presence of excess elements Ca and Mg in the river waters, the absolute contents of which are two orders of magnitude higher than the concentrations of priority flood macroelements (Fe and Al). This feature is reflected in the TDS of the waters. During the low-water period, the TDS of the river waters on average for the river (109 mg/L) is 1.4 times higher than during the flood (80 mg/L). During the flood, the river waters are significantly saturated with rare earth elements, as well as Sn, Fe, Al, Mn, Zr, Cs, Pb, Th, Be, Ti, Co, Cu, Tl, V, Bi, As. The active entry of these chemical elements into the river waters during the flood is due to abundant soil runoff and the ability of these elements to form organic and inorganic complexes, firmly bind with iron colloids and to be sorbed on the surface of soil colloids. During drier periods of the low water season, when groundwater recharge makes a greater contribution to the formation of the river runoff, the concentration of most elements, including rare earth elements, decreases. Under the contrasting geological conditions of the studied territory, in which repeated replacement of neutral argillites by alkaline marls is observed, geochemically depleted carbonate rocks have a greater influence on the composition of the waters during low-water seasons. A comparative analysis of water chemistry during flood and low-water periods allowed us to identify the second group of elements—Ba, Sb, B, S, Na, U, Mo, K, Sr, Ca, Mg, Li, Re, Rb, Si, and Zn, the entry of which into the river waters is associated with underground feeding and, accordingly, the specificity of rocks. A study of variations in the elemental composition of the Sochi River waters in different phases of the water regime allowed us to identify groups of elements, the increased contents of which at a certain phase of the regime will be associated not with technogenic load, but with the factor of the composition of rocks of the geological base (during low water) or abundant soil runoff (during flood).</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Elemental Composition of Waters of the Sochi River, the Black Sea Coast of Russia, during Flood and Low-Water Seasons

  • 期刊论文

  • 发表日期：

    2025年9月16日

查看全文
  • P. S. Lesnikova,
  • L. V. Zakharikhina

摘要

Abstract

The elemental composition of the Sochi River waters varies sharply with the change of phases of the water regime. During the flood period it is quite rich, during the low water period it is comparatively poor. During the flood period, the river waters are enriched with 19 chemical elements relative to their average concentrations in river water of the continents (Clarkes), and during the low water period, with only 7. The total contents of excess chemical elements in different phases of the water regime, on the contrary, are higher during the low-water period due to the presence of excess elements Ca and Mg in the river waters, the absolute contents of which are two orders of magnitude higher than the concentrations of priority flood macroelements (Fe and Al). This feature is reflected in the TDS of the waters. During the low-water period, the TDS of the river waters on average for the river (109 mg/L) is 1.4 times higher than during the flood (80 mg/L). During the flood, the river waters are significantly saturated with rare earth elements, as well as Sn, Fe, Al, Mn, Zr, Cs, Pb, Th, Be, Ti, Co, Cu, Tl, V, Bi, As. The active entry of these chemical elements into the river waters during the flood is due to abundant soil runoff and the ability of these elements to form organic and inorganic complexes, firmly bind with iron colloids and to be sorbed on the surface of soil colloids. During drier periods of the low water season, when groundwater recharge makes a greater contribution to the formation of the river runoff, the concentration of most elements, including rare earth elements, decreases. Under the contrasting geological conditions of the studied territory, in which repeated replacement of neutral argillites by alkaline marls is observed, geochemically depleted carbonate rocks have a greater influence on the composition of the waters during low-water seasons. A comparative analysis of water chemistry during flood and low-water periods allowed us to identify the second group of elements—Ba, Sb, B, S, Na, U, Mo, K, Sr, Ca, Mg, Li, Re, Rb, Si, and Zn, the entry of which into the river waters is associated with underground feeding and, accordingly, the specificity of rocks. A study of variations in the elemental composition of the Sochi River waters in different phases of the water regime allowed us to identify groups of elements, the increased contents of which at a certain phase of the regime will be associated not with technogenic load, but with the factor of the composition of rocks of the geological base (during low water) or abundant soil runoff (during flood).