Ecological and geochemical aspects of interlayer water use for potable water supply of urban population: a case study in the Dnieper–Donetsk aquifer system, Ukraine

• 作者: OA Tetiana Koshliakova Kateryna Zlobina Iryna Kuraieva M.P.Semenenko Institute of Geochemistry Mineralogy and Ore Formation of the NAS of Ukraine
• 来源期刊: 地球化学学报(英文）
• 学科: 地球科学
• 年，卷（期）: 2023,（3）
• 页码范围: 149-165
• 页数: 17页
• 语种: 中文

摘要

The article is devoted to the study of ecological and geochemical features of interlayer waters of the Dnieper–Donetsk aquifer system in Ukraine, used for the potable water supply of Kyiv. A wide range of methods was used, including Microsoft Excel, Statistica, and Attestat software packages, MapInfo Professional 6.5 and ArcGIS-ArcMap 9.3 programs; the method of mass spectrometry with inductively coupled plasma(ICP-MS) and GEMS software were performed. Monitoring study results(during 2007–2023) were analyzed for two interlayer aquifers—Cenomanian-Callovian groundwater complex and Bajocian aquifer. It was determined that the normalized value of mineralization increased with a decrease in water intake during 1980–2010, which indicates a relative increase in the content of mineral substances during longterm exploitation. A high negative correlation(Kcor. =-0.54 to-0.86) is also typical for normalized values of oxidizability, total hardness, pH, Ca, Mg, and Cl content.Comparative analysis of two different aquifers revealed that the macrocomponent composition of Bajocian aquifer remains stable, once for Cenomanian-Callovian groundwater complex, there is a tendency to decrease hydrogen carbonates and increase chlorides and sulfates, whereas the cation composition remains relatively stable. A significant increase(by 55%) of the total mineralization in the representative well located on the right bank of the Dnieper River was found. There is also a significant increase(by more than 5 times) in the iron content, which the authors associate with the unsatisfactory technical condition of the well casing pipes. Physico-chemical modeling of trace elements, performed for investigated aquifers, shows that both aquifers are characterized by the predominant migration of the following metals in the cationic form(aqua-ions): Ca, Mg, Na, Ba, Co, Cu, Mn, Ni, Sr, Zn. It was found that the predominant migration forms of metals in the studied interlayer waters are free uncomplexed ions,carbonate, and hydroxo complexes.