贵州锦江河(梵净山-江口)夏季水质空间分布特征

Spatial distribution characteristics of summer water quality in Jinjiang River(Mount Fanjing-Jiangkou),Guizhou

夏季为贵州梵净山旅游高峰期,为了解锦江河(梵净山-江口)夏季水质空间分布特征,沿水流方向在研究河段上设置9个采样点,对水体基本水质指标、金属元素含量进行研究。结果表明:1)化学需氧量(COD_(Cr))、氨氮(NH+4-N)和总磷(TP)含量及Ca、Si、Mg、Na、K 5种金属元素含量呈上升趋势;2)Pb、As、Hg、Cr 4种重金属元素含量呈下降趋势,城区处采样点的重金属含量总体低于野外采样点的含量;3)所有采样点除重金属Hg,其他指标基本满足Ⅴ类地表水质量环境标准。

To study the spatial distribution characteristics of summer water quality in Jinjiang River,9 sampling sites were set up along the river from Mount Fanjing to Jiangkou,and the basic water quality indexes and the contents of metal elements in water were detected.The results showed that:(1)chemical oxygen demand(COD_(Cr)),ammonia nitrogen(NH+4-N),total phosphorus(TP),and the contents of Ca,Si,Mg,Na and K were on the rise from Mount Fanjing to Jiangkou;(2)the contents of Pb,As,Hg and Cr showed a downward trend,and the contents of heavy metals at the urban sampling sites were generally lower than those at the field sampling sites;(3)except the content of Hg,the water quality indexes of all the sampling sites were mostly in accord with theⅤcategory of the surface water quality standard.