title: [Study on the contamination of algae and microcystins in water sources of Zhengzhou City].
abstract: Planktonic algae and microcystins (MCYST) were detected constantly in water sources of Zhengzhou City from 1996 to 1997. There is significant seasonal variation of the density of algae. The peak of algae occurring in February and December is about 1,068,000/L. The contents of MCYST in July, 1995 and in January, 1996 were over 200 ng/L. According to the Carlson's trophic state index(TSI), and indexes of total nitrogen, phosphorus, COD value and algae density, an eutrophication of water source having emerged in Zhengzhou is considered.
authors.affiliation: Health and Epidemic Preventive 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
mesh_terms: D001427:Bacterial Toxins / Q000032:analysis*; D000087522:Cyanobacteria Toxins; D056890:Eukaryota; D008387:Marine Toxins / Q000032:analysis*; D052998:Microcystins; D014876:Water Pollution; D014881:Water Supply / Q000032:analysis*
chemical_list: D001427:Bacterial Toxins; D000087522:Cyanobacteria Toxins; D008387:Marine Toxins; D052998:Microcystins