Sakai Manabu
Yokohama Environmental Research Institute, 1-2-15, Takigashira, Isogo Ward, Yokohama City 235-0012, Japan.
Ecotoxicol Environ Saf. 2006 Jun;64(2):215-20. doi: 10.1016/j.ecoenv.2005.03.001.
Rainwater samples were collected at Isogo Ward of Yokohama City, Japan, from 23 June to 31 July 2003. The toxic potency of pollutants present in 13 rainwater samples was tested using Daphnia magna. Most test animals died within 48 h in five test solutions that were prepared from rainwater samples. On the other hand, when nonpolar compounds such as pesticides were removed from rainwater samples before the toxic tests, mortalities in all test solutions were less than 10%. Eight kinds of pesticides were detected in rainwater samples. The highest concentration was of dichlorvos, at 0.74 microg/L. Results indicated that insecticides in rainwater sometimes lethally affected D. magna and that toxic potency of insecticides that are present in rainwater constitutes an important problem for environmental protection.
2003年6月23日至7月31日期间，在日本横滨市矶子区采集了雨水样本。使用大型溞对13个雨水样本中存在的污染物的毒性进行了测试。在由雨水样本制备的五种测试溶液中，大多数测试动物在48小时内死亡。另一方面，在毒性测试前从雨水样本中去除农药等非极性化合物时，所有测试溶液中的死亡率均低于10%。在雨水样本中检测到了八种农药。最高浓度的是敌敌畏，为0.74微克/升。结果表明，雨水中的杀虫剂有时会对大型溞产生致命影响，雨水中存在的杀虫剂的毒性对环境保护构成了一个重要问题。
