Calculation of Visual Background Values of Major Groundwater Components Taking Karamay City as an Example

Feiran Zheng, Jingwen Ren, Jing Liu, Wenchao Yuan, Yanna Xiong () and Zhijuan Li ()
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Feiran Zheng: Tianjin Agricultural University, Tianjin 300382, China
Jingwen Ren: HeNan First Geology and Mineral Survey Institute Co., Ltd., Zhengzhou 471399, China
Jing Liu: Technical Centre for Soil, Agriculture and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing 100012, China
Wenchao Yuan: Technical Centre for Soil, Agriculture and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing 100012, China
Yanna Xiong: Technical Centre for Soil, Agriculture and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing 100012, China
Zhijuan Li: Henan Academy of Geology, Zhengzhou 450016, China

Sustainability, 2024, vol. 16, issue 12, 1-18

Abstract: Based on the groundwater chemistry data from Karamay City, Xinjiang Province, this study examines seven major components: K + , Ca 2+ , Na + , Mg 2+ , SO 4 2− , Cl − , and HCO 3 − . The sampling was conducted during two periods: flood and dry periods. On the basis of analyzing the regional geologic background and hydrogeologic conditions, the study area was divided into calculation units and the test data validity was screened. Then, the outliers were eliminated by Grubbs’ method and Piper’s trilinear plot method, and the effectiveness of the elimination was evaluated by the box-and-line diagram. After that, the distribution types of the groundwater chemistry data in each calculation unit were judged to obtain the background values of the seven test indexes for the groundwater in different calculation units. The results show that Grubbs’ method and Piper’s trilinear plot method are effective in removing outliers. Secondly, the background values of Na + and Cl − in the groundwater of Karamay City are mostly higher than those of other anions and cations during the two sampling periods. This phenomenon may be due to the concentration effect of evaporation. Additionally, the groundwater background values of Ca 2+ , Na + , and Cl − showed more significant differences between the two sampling periods compared to other ions.

Keywords: Karamay City; groundwater background values; groundwater chemical characteristics; groundwater contamination onset values (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
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