Abstract
The early phase rain fall current of the time appearance characteristic of benzo (a) pyrene contained in combined sewerage overflow, separate sewerage rain-water drainage, and road runoff was investigated. Analytical conditioning method of benzo (a) pyrene was also examined. Benzo (a) pyrene is one of polynuclear aromatic hydrocarbons which are carcinogenic agents contained in auto exhaust, and it is carried in rivers and sea by initial rain fall. As for benzo (a) pyrene accumulated with bottommud, that influence to ecosystem is pointed out.
Benzo (a) pyrene didn't exist in the filtrate of rain water samples, but absorbed with the suspended solid almost. Benzo (a) pyrene was detected with high concentration in road runoff and combined sewerage overflow. It was suggested that sediment in the sewerage pipe and road sediment coexisted in the combined sewerage overflow, and that the road sediment contaminated with benzo (a) pyrene was still drained after the sediment in the pipe which was easy to be transferred.
