The surface water quality directly affects the human health .This experiment measures and analyzes the water temperature , PH value , chemical oxygen demand (cod ) , biochemical oxygen demand (cod ) , ammonia nitrogen ,hexavalent chromium ,total nitrogen ,and dissolved oxygen of different river reach of River A and B in a region ,in order to find the problems of water quality in time ,prevent and control water pollution ,and provide scientific references for protecting the surface water quality .%指出了地表水的质量直接影响着人体健康，对某地区A、B两河流，不同河段的水温、pH值、化学需氧量、生化需氧量等几项水质参数进行了测定，并对测定结果进行了分析。以便及时发现水质问题，为预防和治理水污染，保护地表水水质提供科学参考。
展开▼
