多摩川におけるビスフェノールAの分布状況と生態系に対するリスク評価

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  • Distribution of Bisphenol A and ecological risk assessment for the Tama River
  • タマガワ ニ オケル ビスフェノール A ノ ブンプ ジョウキョウ ト セイタイケイ ニ タイスル リスク ヒョウカ

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<p>Bisphenol A (BPA) is suspected of risk for ecological damage, but the risks are little known in Japan’s coastal areas. A major goal of this research is to identify the risk of bisphenol analogs (BPs) in Japan’s coastal areas. In this paper, ecological risk was first assessed in the Tama River towards understanding future ecological risk for Tokyo Bay. A total of 74 chronic toxicity datasets testing aquatic species resident in Japan were found in published literature. These were simulated using species sensitivity distribution (SSD) divided into reproductive and non-reproductive effects. Measured environmental concentration (MEC) obtained by actual field measurements (monitoring data) was used to represent exposure conditions. The risk of BPA in Tama River waters was assessed by hazard quotient (HQ) method. The 95th percentile concentrations were used to calculate HQ. The results showed that BPA was found at a concentration in the range of 0.008–0.083 μg/L in the Tama River. Predicted no-effect concentrations (PNEC) for reproductive and non-reproductive effects were 0.014 μg/L and 0.38 μg/L, respectively. Using these results, HQ was calculated to be 6.0 for reproductive effects and 0.2 for non-reproductive effects. Because reproductive endpoints are a risk concern, it is necessary to continue investigation in the future.</p>

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