title: [Preliminary survey on water eutrophication and microcystins level in Beijing Miyun Reservoir].
abstract: OBJECTIVE
  In order to survey water eutrophication and microcystin levels in Beijing Miyun Reservoir.
  
  
  METHODS
  Mivrocystin-LR (MC-LR), and MC-RR were determinated by LC/MS/MS at 5 sample sites in Miyun Reservoir. Eutrophication parameters, which were determinated by conventional analytical methods, included algae number, chlorophyll-a (Chl-a), total phosphor (TP), total nitrogen (TN), COD,TOC, Fe, turbidity and water temperature.
  
  
  RESULTS
  Water in Miyun Reservoir was polluted very little by organic matter. According to Chl-a, TP appraise criterion and grading method, Miyun Reservoir was eutrophicated very little. MC-LR and MC-RR could be detected out in water of Miyun Reservoir. Maximum concentration was discovered in September, MC-LR 41 ng/L and MC-RR 18 ng/L respectively.
  
  
  CONCLUSIONS
  Beijing Miyun Reservoir was poor-eutrophic. Microcystins concentration in water of Miyun Reservoir was far lower than our country health standard.
authors.affiliation: Beijing Center for Disease Prevention and Control, Beijing 100013, China.
authors.forename: Hehui
authors.initials: H
authors.lastname: Zheng
authors.forename: Cheng
authors.initials: C
authors.lastname: Qian
authors.forename: Bing
authors.initials: B
authors.lastname: Shao
authors.forename: Zhiqin
authors.initials: Z
authors.lastname: Zhu
mesh_terms: D002681:China; D004784:Environmental Monitoring; D005068:Eutrophication; D052998:Microcystins / Q000032:analysis*; D014873:Water Pollutants / Q000032:analysis*; D014881:Water Supply
chemical_list: D052998:Microcystins; D014873:Water Pollutants; C078588:microcystin