title: [Studies on algae and microcystin pollution in source water of Yellow River in Zhengzhou city].
abstract: OBJECTIVE
  To study the law of development of pollution with algae and microcystin (MC) in source water of Yellow River in Zhengzhou city.
  
  
  METHODS
  Algae and MC were detected continuously for source water samples collected from B and S Water Works of Zhengzhou in 1998. Microcystin was determined with high-sensitive ELISA.
  
  
  RESULTS
  Monthly average density of algae was 1,439 x 10(4)/L in source water of B Water Works of Zhengzhou, with peak algae density of 4,762 x 10(4)/L in August, and that of S Water Works was 1,071 x 10(4)/L. Blue-algae of higher toxicity has become dominant species in source water from S water Works. Detection rate of microcystin was 70.83% in 24 samples collected from the two water works.
  
  
  CONCLUSIONS
  According to Carlson's trophic state index (TSI), as well as other indices, such as total nitrogen, total phosphorus, chemical oxygen demands (COD) and algae density in water, source water in Zhengzhou has presented characteristics of eutrophication.
authors.affiliation: Health and Epidemic Prevention Station of Henan Province, Zhengzhou 450003, China.
authors.forename: Y
authors.initials: Y
authors.lastname: Meng
authors.forename: D
authors.initials: D
authors.lastname: Zhang
authors.forename: X
authors.initials: X
authors.lastname: Wang
authors.forename: B
authors.initials: B
authors.lastname: Zhu
authors.forename: H
authors.initials: H
authors.lastname: Zhang
authors.forename: H
authors.initials: H
authors.lastname: Wang
mesh_terms: D001427:Bacterial Toxins / Q000032:analysis*; D002681:China; D056890:Eukaryota; D005618:Fresh Water / Q000032:analysis*; D052998:Microcystins; D010456:Peptides, Cyclic / Q000032:analysis*; D014873:Water Pollutants / Q000032:analysis*; D014881:Water Supply / Q000032:analysis
chemical_list: D001427:Bacterial Toxins; D052998:Microcystins; D010456:Peptides, Cyclic; D014873:Water Pollutants; C078588:microcystin