Investigation was carried out to observe the dominant bacteria and the effect of metals(Cd & Zn) and its nitrate compound on growth of bacteria isolated from the three tributaries and lower reach of the Nakdong River. Mean CFU(log10) level was highest in Kumho River(8.30 CFU), Nam River, Hwang River, and Mulgum followed. Staphylococcus xylosus, Staph. lentus, Pasteurella pneumotropica, Aeromonas hydrophilla were dominant species in each study site. Cadmium powder and Zinc powder showed strong effect to inhibit the growth of Micrococcus spp., Pasteurella pneumotropica, Aeromonas hydrophilla. But, nitrate compounds of Cd and Zn(Cd(NO3)24H2O, Zn(NO3)26H2O) did not clearly show the strong effect to inhibit the growth of dominants.

• 박중철(신라대학교 화학과) | Jung-Chul Park
• 하경(신라대학교 환경공학과) | Kyong Ha
• 손연주(신라대학교 환경공학과) | Yoen-Ju Son
• 박재림(신라대학교 환경공학과) | Jae-Rim Park Corresponding Author