高松市およびその周辺の水系におけるビスフェノールAおよびP-N-ノニルフェノール濃度の年間変動

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Considerable attention has recently been focused on environmental chemicals that disrupt the reproductive systems by altering steroid receptor functions. The chemicals were named endocrine disruptors (EDs) or environmental hormones. Bisphenol A (BPA) and nonylphenol (NP) are noticed as EDs, since they widely exist our environment and show estrogenic activities. In this study, we investigated the concentrations of BPA and NP in the water of Kohtoh-river, Goboh-river, Kabe-river, Hazamakami-pond, and Mure-harbor, which were located in Kagawa prefecture, once a month from November 2000 to October 2001. p-n-NP was not detected in any place and time investigated. However, BPA was detected in all places and time. The average concentrations of BPA in Kohtoh-river, Goboh-river, Kabe-river, Hazamakami-pond, and Mure-harbor were 100,176,117,39,and 151 ng/l, respectively. The concentration tended to increase in a period of water shortage except Goboh-river. Thus, the average concentration of BPA in Goboh-river was highest in all places investigated, and not affected by a period of water shortage. It may be because this river runs through the center of Takamatsu city and the most part of the flow consists of domestic waste. BPA concentration in Kabe-river was increased markedly when it was dredged. This result suggests that BPA is precipitated on the bottom of a river. Our investigation shows that BPA is discharged constantly throughout the year and pollutes water area widely, and its concentration is high in a densely built-up area.

高松市およびその周辺の水系におけるビスフェノールAおよびP-N-ノニルフェノール濃度の年間変動

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