中文关键词水化学离子来源元素比值化学风化然乌湖 英文关键词hydrochemistryion sourceelement rationschemical weatheringRanwu Lake

作者	单位	E-mail
张涛	中国地质调查局水文地质环境地质调查中心, 保定 071051	277169074@163.com
王明国	中国地质调查局水文地质环境地质调查中心, 保定 071051
张智印	中国地质调查局水文地质环境地质调查中心, 保定 071051
刘廷	中国地质调查局水文地质环境地质调查中心, 保定 071051
何锦	中国地质调查局水文地质环境地质调查中心, 保定 071051

中文摘要 为研究然乌湖流域地表水水化学特征及离子来源，在然乌湖流域采集了地表水样品和雨水样品，综合利用相关性分析、Piper三线图和Gibbs模型等方法，分析了该区地表水主要离子特征及其控制因素，揭示了该区地表水水中的主要物质来源.结果表明，然乌湖流域地表水pH为7.54~8.48，呈弱碱性，并具有较低的溶解性总固体（59.89~96.75 mg ·L^-1），阳离子主要以Ca²⁺和Mg²⁺为主，Ca²⁺当量浓度占阳离子总量的63.3%~76.2%，均值为67.2%，Mg²⁺当量浓度占阳离子总量的23.4%~36.2%，均值为31.4%，Ca²⁺和Mg²⁺约占阳离子总量的98.5%.阴离子以HCO₃^-为主，HCO₃^-占阴离子总量的74.31%~84.29%，均值为78.21%，SO₄^2-占阴离子总量的9.59%~19.37%，二者约占阴离子总量的93.55%.水化学类型为HCO₃-Ca和HCO₃-Ca ·Mg型，水文地球化学过程受人类活动影响较弱，主要受岩石风化作用控制，主要离子来源于碳酸盐岩及硅酸盐岩的风化溶解. 英文摘要 To study the chemistry of surface water and potential control measures in the Ranwu Lake basin, 19 samples were collected from Ranwu Lake in 2019. Conventional hydrochemical techniques and statistical analysis methods (descriptive statistics, the Gibbs figure, ion ratio, Piper triangular diagrams) were applied to better understand the solute geochemistry and surface water hydrochemistry in the Ranwu Lake catchment. Surface water in the Ranwu catchment is slightly alkaline (pH of the samples ranged from 7.54 to 8.48 with an average value of 8.06). The concentrations of total dissolved solids (TDS) in the water range from 59.89 to 96.75 mg ·L^-1 with an average of 79.98 mg ·L^-1, the total dissolved solids of all samples are less than 100 mg ·L^-1 and belong to fresh water. The TDS are dominated by Ca²⁺, Mg²⁺, HCO₃^-, and SO₄^2- in the Ranwu Lake. The ion concentrations in the lake water samples are in the order of Ca²⁺ > Mg²⁺ > Na⁺ > K⁺. The concentrations of Na⁺and K⁺are very low. Ranging from 0.5 to 1.21 mg ·L^-1, with an average value of 0.58 mg ·L^-1, the equivalent concentration of Ca²⁺ accounts for 63.3% to 76.2% of total cations with an average value of 67.2%. The equivalent concentration of Mg²⁺ accounts for 23.4% to 36.2% of total cations with an average value of 31.4%. Ca²⁺ and Mg²⁺ account for 98.5% of total cations. The main anions were HCO₃^- and SO₄^2-. The equivalent concentration of HCO₃^- accounts for 74.31% to 84.29% of total anions with an average value of 78.21%. The equivalent concentration of SO₄^2- accounts for 9.59% to 19.37% of total anions with an average value of 15.34%. HCO₃^- and SO₄^2- together account for 93.55% of total anions on average. All the water samples fall in the water-rock interaction field, which suggests that the weathering of rocks primarily controls the major ion chemistry of groundwater in this area. Solutes are mainly derived from carbonate weathering and silicate weathering. The role of cation exchange in the geochemical process of the lake and the influence of human activities on the lake are found to be weak.

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