• Corpus ID: 54692437

九州大学学術情報リポジトリKyushu Biological Monitoring to Detect Both Water Pollution and Water Pollution and Water Quality Recovery Based on Value Movements of Freshwater

@inproceedings{KangKyushuBM,
  title={九州大学学術情報リポジトリKyushu Biological Monitoring to Detect Both Water Pollution and Water Pollution and Water Quality Recovery Based on Value Movements of Freshwater},
  author={Ik Joon Kang and Ken Nagafuchi and Tsuneo Honjo and Yohei Shimasaki and Yuji Oshima}
}

• I. Kang, K. Nagafuchi, +2 authors Y. Oshima
• Environmental Science

The valve movement pattern of the freshwater bivalve Corbicula japonica ( C. japonica ) following exposure to test chemicals was monitored. We conducted the exposure test with two heavy metal compounds, cadmium chloride (CdCl 2 ; 0, 0.1, 1, or 10 mg/L) and copper (II) chloride (CuCl 2 ; 0, 0.1, 1, or 10 mg/L) in a continuous flow system. After a pre–exposure period in a test chamber, which was filled with dechlorinated tap water for 1 h, the bivalves were exposed to the test chemicals for 3 h. After that, only dechlori- nated tap water was released again into the test chamber for 2 h. Thus, the valve movements were continu-ously recorded for a total of 6 h. On exposure to CdCl 2 (1 and 10 mg/L), the valve movement of C. japonica closed. However, the valve movements of C. japonica in all CdCl 2 groups recovered after termination of the exposure. C. japonica showed decreased distance between the valves on exposure to CuCl 2 (0.1, 1, and 10 mg/L). However, C. japonica restarted their valve movements only in the recovery period at 0.1 mg/L CuCl 2 . Therefore, we conclude that real–time monitoring of the valve movement of C. japonica is a useful method to detect both the contamination with a toxicant and recovery of the water quality in an aquatic ecosystem. In addition, it can be used for the assurance of the water quality.