Abstract
In this research, the fate of cyanobacterial toxin, microcystin in Lake Biwa were investigated. And we also examined the toxin analysis using ELISA method. Microcystin was detected in the Lake Biwa water and its filtrate. The concentration was varied depending upon the sampling stations, and increased to 2, 200pg/mL in the maximum with the coincidence of the water bloom. Microcystin was not detected in the tap water from Lake Biwa, which suggested that the microcystin would be removed in the water treatment process. The ratio of filtrate micocystin to total microcystin was varied. Although the ratio of microcystin in filtrate decreased with increase of total micocystin concentration, relationship between the ratio and the pH value of lake water was not observed.
