Stable hydrogen and oxygen isotopes and hydrochemical characteristics of domestic water sources-A case study of Tianjin
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Abstract:
The tap water samples were collected at main districts of Tianjin in 2017. The tap water samples were collected from the direct and seco ndary water supply in the central urban city and Xiqing District in 2019. All water samples were analyzed on the compositions of stable hydrogen and oxygen is otopes and majorions. The range of stable oxygen is otope (∮18 O) in the tap water was from - 4. 41‰ to - 10. 06 ‰ , and the range of hydrogen isotope (∮D) was from - 52. 4‰ to - 74. 4 ‰ , respectively. The isotopes in the tap water ( Hanjiang river as the water source) were located near the Global Meteoric Water Line ( GMWL) , however, the reservoir storage may cause the isotopic enrichment in the tap water. The stable isotopes were depleted in the tap water which used the deep groundwater as the w ater source. The water type of tap water in the central urban area and Xiqing , Jinnan, Beichen, Wuqing and Jizhou districts was Ca· Mg-HCO3. The water type of tap water in Binhai New Area andBaodi district was Na·Mg2SO4 . The tap water in Ninghe district was the type of Na-HCO3 . The tap water quality in Tianjin was under the national guideline of drinking water. There was no significant different in hydro chemical composition of tap water between the direct water supply and the secondary water supply . Thus, the water quality of tap water from Hanjiang river was better than that from the local deep groundwater. The ion mass concentrat ions of Na+ and SO4 2- in the t ap water were high at the Binha i New Area due to the reser voirstorage. The mass concentration of Na+ in the tap water at Ning he district and the NO3 - in the tap water at Jizhou district was the highest. Consequently, the protection of groundwater and the safety of drinking water in the centralized water supply areas should require more attention and improvement.
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