小清河口水环境质量评价及主要污染物入海通量研究

根据2010至2015年小清河口区监测数据，系统分析了小清河口水环境质量状况及主要污染物入海通量变化规律。结果表明:小清河口总磷（TP）、化学需氧量（COD）和石油类等污染物浓度超出《地表水环境质量标准》（GB3838-2002）Ⅲ类水质标准。小清河口综合污染指数均值为16.79，平均污染指数均值为1.53，石油类和COD是小清河口区域主要污染因子，监测期间水环境质量呈好转趋势。小清河年均污染物入海总量约为159766 t，污染物入海量中COD起主导作用。小清河污染源包括点源污染和面源污染，点源污染来自于沿岸入河排污口，面源污染主要来自于农业生产中化学肥料。

Quality assessment of aquatic environment and fluxes of major pollutants to the Xiaoqing River estuary

On basis of the field monitoring data obtained from 2010 to 2015, quality of water environment in the Xiaoqing River estuary was assessed and the flux variations of its major pollutants were explored systematically. The results showed that average concentrations of total phosphorus (TP), chemical oxygen demand (COD) and petroleum were all beyond the quality standards for Class Ⅲ water, according to Environmental Quality Standards for Surface Water (GB3838-2002). In Xiaoqing River estuary, the average comprehensive pollution index was 16.79 and the average pollution index was 1.53. Moreover, the major two pollutants of Xiaoqing River estuary were petroleum and COD, and the quality of water environmenthad been generally improved during 2010 to 2015. The average total amount of major pollutants discharge into the sea from the Xiaoqing River was 159766 t, in which COD played the leading role. Sources of pollutants in the Xiaoqing River included point pollution and non-point pollution. The point source pollution came from coastal sewage outfall of Xiaoqing River, while the non-point pollution came from chemical fertilizers in agriculture.