Төв аймгийн баруун урд бүсийн ундны усны чанар, найрлага. (Mongolian)

This research work was performed within the framework of the project titled “The survey on the drinking water quality of settlement areas of Tuv province, conclusion and recommendation” implemented at the Institute of Geography and Geoecology, MAS in 2021, and some of the research results are summarized in this article. We took totally 16 samples from the water supply wells at the center of 8 soums. Performed by physicochemical, micro-elements, and bacteriological analysis, and determined the chemical composition, quality and pollution parameters and the quality and composition. We determined the quality of underground water was evaluated by calculating the water quality index (WQI). As regards the anions, the first most prominent water types are the Ca-[HCO 3 ] (50%), the second Х-[HCO 3 ] (43.7%), the third Ca-[HCO 3 -SO 4 2- ] (6.3%) and groundwater was dominated by mixed type of water. From the study results, in case of mineralization, groundwater at 50% surveyed locations belongs to fresh, 50% belongs to freshly or relatively high mineralization. In case of hardness, groundwater at 43.7% belongs to softish, 50% belongs to moderately hard and the remaining 6.3% to hard, respectively. According to the analysis of microelements, the uranium concentration (U 33-176 µg/l) was 1.1-5.86 times higher than the drinking water standard, strontium concentration (Sr 2021µg/l) was 21 μg/l more (1 out of 16), and nitrate concentration (NO 3 63.0 mg/l) was 1.26 times more (1 out of 16) of the total groundwater samples. Total 11 samples collected from sampling points and the water supply wells covered by the survey does not meet the requirements of Drinking water. Hygienic requirements, and assessment of quality and safety MNS 0900:2018 standard by any or several parameters. [ABSTRACT FROM AUTHOR]

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