| Title |
Toxicity Monitoring of River Sediments in the Geum River Basin using Daphnia magna and Moina macrocopa |
| Authors |
조혜윤 ( Hye Yoon Cho ) ; 유지수 ( Ji Su Yoo ) ; 한영석 ( Young Seok Han ) ; 한태준 ( Tae Jun Han ) ; 김상훈 ( Sang Hun Kim ) ; 정진호 ( Jin Ho Jung ) |
| Keywords |
Aqueous extracts; Organic extracts; Pore water; River sediment; Toxicity monitoring |
| Abstract |
In this study, toxicity monitoring of sediments collected from 25 stations in the Geum river basin was conducted using Daphnia magna and Moina macrocopa. According to the results of acute toxicity tests (immobilization and mortality) of organic extracts of semdiments, Miho stream showed much less toxicity than Gap and Nonsan streams. In particular, significant toxicity was observed in both species for St. 15 and St. 16 sediment samples that passed through Deajeon city as a branch of Gap stream. For Nonsan stream, St.23 sediment showed high toxicity toward M. macrocopa. This site seemed to be affected by upper agricultural industrial complex. Additionally, M. macrocopa showed a higher sensitivity than D magna for organic extracts of sediments. In the case of toxicity tests using sediment pore water and aqueous extracts, only pore water of St.27 sediment was toxic against D. magna. Toxicity identification evaluation showed that hydrogen sulfide was likely a major toxicant in the pore water. |