新汴河水化学主离子与电导率特征研究

Study on the Characteristics of Major Ions and Conductivity in Xinbian River

在对新汴河主离子成分测定的基础上,分析了主离子与电导率的定量关系,利用Piper三线图和Gibbs图分析了新汴河的水化学主离子特征及其控制因素。结果表明,新汴河K+和HCO_(3)^(-)浓度变化较小,Ca^(2+),Mg^(2+),Na^(+),Cl-和SO_(4)^(2-)浓度在引河汇入处发生阶跃变化,其中Mg^(2+),Na^(+),Cl-,SO_(4)^(2-)浓度在引河汇入后明显减小,而Ca^(2+)在引河汇入后明显增大。新汴河溶解性总固体(TDS)与电导率(EC)之间呈正相关,两者之间可表示为TDS=0.58EC+24.9。新汴河以引河为界,上游段和下游段离子组分存在较大差异,上游段水化学类型为HCO_(3)^(-)—SO_(4)^(2-)—Cl-—Na^(+)型,下游段水化学类型为HCO-3—Na^(+)—Ca^(2+)型,而引河水的化学类型为HCO_(3)^(-)—Ca^(2+)—Na^(+)型。新汴河上、下游段水化学类型发生改变是由引河水的汇入引起的。

Based on the determination of the major ions in Xinbian River,the quantitative relationship between the major ions and the conductivity was analyzed.The hydrochemical characteristics of Xinbian River were analyzed by the Piper and Gibbs diagram.The results show that:no significant changes in the K+and HCO_(3)^(-) concentrations in the Xinbian River were found;the concentration of Ca 2+,Mg^(2+),Na^(+),Cl-and SO_(4)^(2-) changed step by step in the Yin River;the concentration of Mg^(2+),Na^(+),Cl-and SO_(4)^(2-) decreased significantly after the Yin River,while the concentration of Ca^(2+)increased significantly after the Yin River.There was a positive correlation between total dissolved solids and conductivity of Xinbian River,which could be expressed as TDS=0.58 EC+24.9.The upstream hydrochemical type was HCO_(3)^(-)—SO_(4)^(2-)—Cl-—Na^(+)and the downstream hydrochemical type was HCO_(3)^(-)—Na^(+)—Ca^(2+),while the hydrochemical type of the Yin River was HCO_(3)^(-)—Ca^(2+)—Na^(+).The change of hydrochemical types in the upstream and downstream of the Xinbian River was caused by the inflow of the Yin River.