摘要
通过对2004-2008年长江口徐六泾江水样品中主要离子(Ca2+,Mg2+,Na+,K+,HCO32-,SO42-,Cl-,NO3-和SiO32-)含量的月观测,以及对2008年9月长江下游调查,研究发现,长江河口水体主要离子浓度与径流呈现很好负相关关系,季节变化明显,但主离子浓度季节差异小于径流量的季节差异.河口水体中K+,Na+,Ca2+,Mg2+,Cl-,SO42-,NO3-,总硬度/总碱度有上升趋势,尤其以SO42-和总硬度/总碱度的上升趋势显著,SiO32-,HCO3-则表现出下降趋势.引起近年来长江口水体主离子浓度变化的影响因素为工业排放、环境酸化、循环盐和三峡蓄水等.
The geochemistry of major ions（Ca^2＋,Mg^2＋,Na^＋,K^＋,HCO3^2-,SO4^2-,Cl^-,NO3^-and SiO3^2-）in the Yangtze River was studied,based on the monthly monitoring data at Xuliujing station for the period of 2004-2008 and the investigation result of the Yangtze River in September 2008.The study found that the concentration of main ions varies clearly in different seasons,with a negative correlation with the discharge of the River.But the difference of the concentration is less clearly than that of the discharge.There is a persistently increasing in the concentrations of K^＋,Na^＋,Ca^2＋,Mg^2＋,Cl^-,NO3^-,SO4 2-and the ratio of hardness/alkalinity;especially the concentration of SO4 2-and the ratio of hardness/alkalinity have a more obvious increasing trend.In contrast,the concentration of SiO3^2-and HCO3^-show a decreasing trend.The changes of major ions mainly result from the environment acidification,the pollution emissions by human,the cyclic salt from sea,the preserved effect by reservoirs establishments etc.
出处
《华东师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第2期34-42,共9页
Journal of East China Normal University(Natural Science)
基金
国家自然科学基金委创新团队(40721004)
教育部科学技术研究重点项目(109067)
上海市科委重大项目(07DJ14003-04)
关键词
长江
化学风化
三峡工程
循环盐
工业污染
the Yangtze River
chemical weathering
the Three Gorges Project
cyclic salt
industrial pollution
