| Title |
The Relationship Between Chlorophyll - a and BOD in the Nakdong River |
| Authors |
신성교 ; 박청길 ; 이수웅 ( Sung Kyo Shin ; Chung Kil Park ; Su Woong Lee ) |
| Abstract |
The relationships between chlorophyll-a(Chl.a) and BOD were investigated through culture and degradation study of phytoplankton and field samples to determine the autochthonous BOD caused by the phytoplankton production in the eutrophic waters in the Nakdong River. The correlation coefficients between Chl.a and BOD, and Chl.a and COD were found to be 0.732 and 0.666 respectively. From the results of culture and degradation of phytoplankton in laboratory, the correlation coefficients between Chl.a and BOD were 0.876(mean value), and 0.968 respectively. Therefore, it was possible to express as TBOD = α. chl.a + allochthonous BOD, and to determine the contribution of autochthonous BOD to total BOD in the Nakdong River. It was found that the percentages of autochthonous BOD in total BOD were 51.7, 47.9, 65.2, 30.5 and 52.6 % at Mulgum, Namji, Jukpo, Koryong and Waekwan. The converting factor(α) for the calculation of autochthonous BOD was depended upon the biomass of phytoplankton as well as the activity, which was changed in accordance with waters conditions. It was found to be 0.042, 0.036, 0.047, 0.029 and 0.048 at Mulgum, Namji, Jukpo, Koryong and Waekwan. |