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Evolution characteristics and genesis of shallow fluorine-bearing groundwater in Wuqing Sag |
SHEN Yue-Fang( ), MA Han-Yu, YANG Yao-Dong, CAO Yang |
Tianjin Geological and Mineral Testing Center, Tianjin 300191, China |
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Abstract In this paper, the Wuqing Sag, a fourth-level tectonic unit where the water source in the north of Wuqing is located, was selected as the research area, and 95 groundwater sampling points were set up. Fluoride groundwater in the first aquifer was taken as the study object.Based on hydrogeological survey and sample analysis, the authors investigated spatial distribution of F- concentrations as well as evolution feature and genesis of fluoride groundwater in shallow aquifer from Wuqing Sag by means of hydrogeochemical plot, statistic analysis and geochemical modeling. The results show that the mass concentration of F- in shallow groundwater in the study area is generally high, the distribution trend is that the concentration in the NW-SE direction is the highest, and the concentration gradually decreases toward both sides, that hydrogeochemical types of groundwater with high F- concentration are relatively complex, and have the characteristics of weak alkali, high sodium and low calcium, and that the formation of high-fluorine water is mainly controlled by the strong evaporation and concentration, fluorite dissolution, calcite-dolomite precipitation, and F- desorption in this area.
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Received: 22 February 2020
Published: 29 April 2021
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Location of sampling sites and distribution of F- concentration of groundwater in shallow aquifer in Wuqing Sag
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指标 | ρ(F-)<1.0 mg·L-1水样(N=56) | ρ(F-)>1.0 mg·L-1水样(N=39) | 最小值 | 最大值 | 平均值 | 最小值 | 最大值 | 平均值 | pH | 7.42 | 8.26 | 7.81 | 7.72 | 8.32 | 8.02 | ρ(F-)/(mg·L-1) | 0.28 | 1.0 | 0.64 | 1.04 | 3.92 | 1.89 | ρ(K+)/(mg·L-1) | 0.3 | 31.2 | 3.1 | 0.4 | 2.2 | 1.0 | ρ(Ca2+)/(mg·L-1) | 20.7 | 316.0 | 156.4 | 25.1 | 215.4 | 75.7 | ρ(Na+)/(mg·L-1) | 38.3 | 530.3 | 192.7 | 46.4 | 610.3 | 273.9 | ρ(Mg2+)/(mg·L-1) | 12.9 | 216.9 | 76.1 | 14.8 | 175.2 | 72.1 | ρ(HC)/(mg·L-1) | 360.0 | 1031.2 | 567.2 | 299.0 | 1119.7 | 726.6 | ρ(S)/(mg·L-1) | 0.30 | 500.70 | 194.7 | 9.4 | 828.3 | 156.5 | ρ(Cl-)/(mg·L-1) | 28.4 | 1045.8 | 299.3 | 42.5 | 744.4 | 235.6 | TDS值/(mg·L-1) | 468.2 | 2600.7 | 1221.84 | 477 | 2825.75 | 1194.76 |
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Descriptive statistics of chemical composition for groundwater samples from Wuqing Sag
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Piper diagram of groundwater samples from Wuqing Sag
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Relationship between F- concentration and pH
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Relationship between F- concentration and TDS
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Relationship between F- and Ca2+ concentrations
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SO42- concentrations ">
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Relationship between F- and concentrations
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Relationship between F- and Cl- concentrations
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Gibbs plot
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Relationship between ρ(F-)and ρ(Na+)/[ρ(Na+)+ρ(Ca2+)]
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Relationship of activities between F- and Ca2+
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Relationship between F- concentration and saturation index of dolomine
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Relationship between F- concentration and saturation index of calcite
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Relationship between F- concentration and saturation index of fluorite
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O3-)/[ρ(HC)+ρ(Cl-)] ">
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Relationship between ρ(F-) and ρ(HC)/[ρ(HC)+ρ(Cl-)]
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O3-)/[ρ(HC)+ρ(S)] ">
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Relationship between ρ(F-) and ρ(HC)/[ρ(HC)+ρ(S)]
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