摘要：Odorous compounds produced from the aquatic microorganisms in the river, lake, pond and moat in Tokyo metropolitan area were studied. The water samples collected from fifteen stations in them and the tap waters of seven stations were examined by massfragmentography of gas chromatographymass spectrometry (GC-MS). Odorous compounds from the culture media of Actinomycetes and Blue-green algae, which were isolated from the waters or the bottom sediments, were also identified by GC-MS. As a result of the micro quantitative analyses of these odorous compounds, 2-methylisoborneol was found in the water samples of all stations in the range of a trace to 4.9μg/l and also detected in the tap water in the range of 0.01 to 0.20μg/l. Geosmin was found in the samples of the five stations in the range of 0.01 to 0.03μg/l. 2-Methylisoborneol from four species and geosmin from other two species were identified in the Blue-green algae isolated from the water samples in Tokyo metropolitan area. It was noticed that both odorous compounds grew out of ten strains of Actinomycetes isolated from the bottom sediments of Chidorigafuchi at the moat of the imperial palace.
