Abstract
A survey was conducted on the water pollution of the Arakawa River by examining pyrogen contents and bacterial contamination. Ten samples were collected from rural and urban areas and analysed by the Japanese pyrogen test (PT), Limulus test (LT), and synthetic chromogenic substrate test (ST) for pyrogen contents. Simultaneously, they were examined for total colonies (TC), psychrotrophic bacteria (PB), coliforms (CF), and Gram-negative bacteria (GB). The results obtained are as follows.
CF, GB, PB and TC of the river water showed a tendency to increase gradually toward the urban area (TC, ranging from 0 to 25, 000/ml;PB, 10 to 40, 000/ml;CF, 0 to 410/ml;GB, 0 to 17, 000/ml).
PT of the river water showed a tendency for pyrogen contents to increase gradually toward the urban area.LT of the river water showed a tendency for endotoxin contents to increase gradually toward the urban area. ST ranged from 6 to 426ng/ml. The results of PT tended to be parallel to those of LT.
