沋河城区段水质指标及离子变化特征研究

Study on Water Quality Index and Ionic Change Characteristics of Youhe River in Urban Area

为探究沋河城区段水质指标空间变化,对渭南市沋河水库至沋河公园河段进行采样,测定样品的离子指标和总可溶解固体(TDS)、pH值、溶解氧、电导率,并利用相关性分析和聚类分析的方法分析其空间分布特征。结果表明,各离子空间差异度较大,其中K^+、NH_4^+、Na^+、Cl^-之间成显著正相关;在沋河各段中,由河流上游至下游,NH_4、Cl^-呈先增后降的趋势,SO_4^(2-)呈增加趋势,NO_3^-呈下降趋势。沋河城区段主要受K^+、NH_4^+、Na^+、Cl^-、SO_4^(2-)的影响,其中K^+、NH_4^+、Na^+、Cl^-均可被水体净化;SO_4^(2-)含量虽然符合国家标准,但是该离子在研究河段呈上升趋势,应重视对SO_4^(2-)人为来源的控制。

In order to explore the spatial variation of water quality index in Youhe River,the samples were collected from Youhe River Reservoir to Youhe River Park in Weinan City,ions and total soluble solids (TDS),pH value,dissolved oxygen and conductivity of the sample were measured,and the spatial distribution characteristics were analyzed by correlation analysis and cluster analysis.The results showed that the spatial difference degree of the .ions was great,among whieh K^+,NH^+,Na^+and CI-were positively correlated.In the Youhe River,from upstream to downstream,NH4^+and Cl^- showed the trend of first increasing and then decreasing,SO4^2-showed an increasing trend,NO^3-showed a decreasing trend.Youhe River was mainly affected by K^+,NH4^+,Na^+,Cl^-,SO4^2-,while the K^+,NH4^+,Na^+,Cl^-could be purified by water body.SO4^2-content met the national standard,but it showed the increasing trend in the researched reach.Therefore,the control of artificial source of SO4^2-should be paid attention to.