单因子标识指数法在浑河抚顺段水质评价中的应用

经济的快速发展给水环境带来巨大压力,水质评价对于制定水环境政策具有重要意义。常见的水环境评价方法大多不能对水体污染程度给出直观判断,且无法进一步区分劣五类水质的污染轻重。文章选用单因子标识指数法,以沈阳经济区典型城市抚顺为研究对象,以溶解氧、高锰酸盐指数、氨氮、总磷和生化需氧量为考察指标评价浑河抚顺段水质。结果显示,溶解氧、高锰酸盐指数沿程均达到水环境功能区标准;氨氮、总磷除St2点位达标外,其余监测点位均超标;生化需氧量全程为劣五类水质。通过单因子标识指数值不仅直观地看出浑河抚顺段各个监测指标是否达到相应水环境功能区标准,还直观地看出未达标指标的超标程度。对于劣五类水质,单因子标识指数值区分出了超过五类标准的程度。

Application of Mark Index Method in Water Quality Assessment of Hun River in Fushun City

Rapid development of economy brought huge pressure to water environment,and environmental quality assessment of surface water was necessary and important for fashioning a policy of water environment.Most common methods of water quality assessment could not give a direct result of pollution level,and still could not distinguish pollution degree if water quality was worse than the fifth level in state standard.Mark index method was used to assess water quality of Hun River in Fushun city which is the typical city of Shenyang economic region.Dissolved oxygen,permanganate index,ammonia nitrogen,total phosphorus and biochemical oxygen demand were the five indexes inspection.As a result,monitoring date of all monitoring sites of dissolved oxygen and permanganate index met the standard of water environmental function region.Monitoring date of ammonia nitrogen and total phosphorus exceeded the standard except monitoring site St2.Monitoring date of biochemical oxygen demand even exceeded the fifth level of the standard.Direct results were given when water quality of Hun River in Fushun city was assessed by mark index method.Exceeding degree was showed if monitoring date exceeded the standard of water environmental function region,even if water quality was worse than the fifth level of the standard.