抄録
Temporal changes in the mutagenicity of roof runoff water from an inclined tiled roof were investigated during two rain events (Surveys 0007 and 0011). Mutagenicity was evaluated by the pre-incubation method using Salmonella typhimurium strains TA98 and TA100 with and without S9mix. The following conclusions were obtained: (1) The first flush phenomena on mutagenicity were observed in Survey 0011, but not observed in Survey 0007, as well as PAHs. (2) Although the relationship between mutagenicity and PAH concentration was unclear under some conditions of the Ames test, mutagenicity and PAH concentration showed a similar trend in most cases. (3) This suggested that one of the main causes of mutagenicity of roof runoff water was a combined effect of many PAHs and their derivatives. (4) The soluble samples showed mutagenicity without S9mix. This could be due to nitrated PAHs.
