# 화학적산소요구량을 이용한 하구해역의 해수중 유기물 기원 고찰

• Kim, Young-Sug (Marine Environment Research Division, National Institute of Fisheries Science) ;
• Koo, Jun-Ho (Marine Environment Research Division, National Institute of Fisheries Science) ;
• Kwon, Jung-No (Marine Environment Research Division, National Institute of Fisheries Science) ;
• Lee, Won-Chan (Marine Environment Research Division, National Institute of Fisheries Science)
• 김영숙 (국립수산과학원 어장환경과) ;
• 구준호 (국립수산과학원 어장환경과) ;
• 권정노 (국립수산과학원 어장환경과) ;
• 이원찬 (국립수산과학원 어장환경과)
• Accepted : 2018.10.26
• Published : 2018.10.31

#### Abstract

In this study, one studied the principal factors and water-quality components that determine the concentration of chemical oxygen demand (COD) in seawater in estuaries, such as the Han, Geum, Youngsan, Seomjin, and Nakdong rivers in Korea. The principal factors determining the concentration of COD in seawater indicated by the principal component analysis were salinity, exogenous origin and autochthonous resources based on chlorophyll-a. Moreover, organic matter in the submarine sediment layer also had a secondary effect. Regression slope assessed the contribution of water-quality components to determine the concentration of COD in the estuary. One found that the effect of salinity on the overall survey was significant. Moreover, the effect of chlorophyll-a was also appeared in April and August. In each estuary, the most significant contribution factor was chlorophyll-a in the Nakdong River and salinity in the Han and Yongsan rivers. The contribution of salinity and chlorophyll-a were found to be the largest in the Geum River. The salinity and chlorophyll-a in the Seomjin River showed a low contribution.

#### Acknowledgement

Supported by : 국립수산과학원

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