Wet and Dry Deposits of Polycyclic Aromatic Hydrocarbons and Their Distribution to Soils, Sediments and Organisms

阐述了多环芳烃（PAHs）在环境中的归宿。对降水、干沉降物、土壤、沉积物、上层水和生物进行了调查。在富山县中部的城市郊区进行了为期一年半的降水和干沉降物的详细调查。每个月收集1-4次降水。分析了多环芳烃的浓度、组成、存款量以及多环芳烃在颗粒相和溶解相的分配。并对沉淀物的致突变性进行了分析。每1-2个月收集一次干沉降物。分析了干沉降物的存款量和多环芳烃的组成。另外，在富山县和石川县的县界的新凑市、大泽野町和伊俄山脉这三个地区进行了土壤调查。从距城市中心区和交通干线的距离以及有机质含量等因素分析了土壤中多环芳烃的含量和组成。对流经富山县中部的Gejo河和Gejo河发源地伊米津山上的水库进行了有关沉积物、上层水和生物的调查。阐明了多环芳烃在沉积物、上层水体和生物体中的分布特征。探讨了水环境中多环芳烃的分布特征。

The fate of polycyclic aromatic hydrocarbons (PAHs) in the environment was elucidated. Investigation concerning precipitation, dry fallout, the soil, sediments, upper layer water and organisms was executed. The detailed investigation concerning precipitation and dry fallout was carried out for one and a half years in the city outskirts region in the central part of Toyama Prefecture. Precipitation was gathered 1-4 times at each month. The concentration, the composition and the amount of the deposit load of PAHs were analyzed as well as the partition of PAHs between the particulate and dissolved phases. The mutagenicity of precipitation was also analyzed. Dry fallout was gathered once every 1-2 months. The amount of the deposit load and the composition of PAHs with the dry fallout were analyzed. The investigation concerning the soil was executed in three regions, that is, Shinminato City, Osawano Town, and Io mountain ranges located in the prefecture boundary in Toyama Prefecture and Ishikawa Prefecture in addition. The concentration and the composition of PAHs in the soil was analyzed from factors such as the distance from the urban area and the trunk line road as well as the amount of the organic matter. The investigation concerning sediments, upper layer water and organisms was carried out in the Gejo river which flowed in the central part of Toyama Prefecture and in reservoirs distributed on the Imizu hill which was the source region of the Gejo river. The distribution characteristics of PAHs included in sediments, upper layer water and organisms were elucidated. The distribution characteristics of PAHs in the water environment were discussed.