2019—2022年河北省境内滹沱河水质综合评价

Comprehensive evaluation of the water quality of Hutuo River in Hebei Province from 2019 to 2022

以河北省境内滹沱河水质为研究对象,设置定魏桥交叉口、退水渠和献县枢纽三个监测点,对该区域2019—2022年的水质进行监测,检测pH值、DO、石油烃、叶绿素a、总氮、高锰酸钾指数等水质指标,利用《地表水环境质量标准》(GB 3838-2002)中Ⅲ类水水质标准和TLI(Trophic Level Index,综合营养状态指数)对水质进行评价。结果表明,采样区水质部分指标劣于地表水Ⅲ类水标准,超标因子依次为总氮、高锰酸钾指数和石油烃;水体营养状态分级表明该地区属于中营养状态,监测的四年中营养状态整体呈逐年下降趋势。

The water quality of the Hutuo River within the boundaries of Hebei Province,China was taken as research object.Three monitoring sites were established for this purpose:Dingweiqiao Intersection,the Tuishui Channel,and Xian County Huh.A comprehensive water quality monitoring program was conducted from 2019 to 2022,which included the assessment of various water quality parameters such as pH value,dissolved oxygen(DO),petroleum hydrocarbons,chlorophyll-a,total nitrogen,and potassium permanganate index(KMnO_(4)index).The evaluation of the water quality was conducted in accordance with the standards for ClassⅢwater quality as stipulated in the Surface Water Environmental Quality Standards(GB 3838-2002),as well as utilizing the Trophic Level Index(TLI),which is a metric designed to assess the overall trophic state of aquatic ecosystems.The results revealed that certain water quality indicators at the sampling sites were found to he substandard in comparison to the ClassⅢwater quality criteria.The contaminants that exceeded the prescribed standards were,in descending order of exceedance;total nitrogen,potassium permanganate index,and petroleum hydrocarbons.The stratification of the trophic state of the water body,as indicated by the TLI,classified the region as being in a mesotrophic condition.Over the course of the four-year monitoring period,there was a consistent downward trend observed in the trophic state,suggesting a gradual decrease in the overall nutrient enrichment of the water body.