만경강 수질의 미생물학적 분석 = Microbiological analysis of water quality of the Mankyung River

다국어 초록 (Multilingual Abstract)

The distribution of microbial indicators of water quality in the Mankyung River was studied along with the analysis of physicochemical factors. Samples were taken from the surface water of 9 sites every three month from October, 1983 to July, 1984 and analyzed. There existed gradual increase in temperature along the downstream. All sites showed similar pH values ranged from 6.6 to 6.8. The oxygen content of river water decreased gradually as it flows through the urban center and industrial area of Chonju city. Annual average value of BOD was found to range from 0.8 to 2.6ppm at the upper streams and from 20.1 to 36.5ppm in the area of urbon center. The annual average population densities of total bacteria counted on nutrient agar medium were in the range of 2.3×10 exp (2) to 3.3×10 exp (6) CFU/㎖ depending on the sites. The water near the urban center and industrial area showed the highest density of total bacteria. The total coliform and fecal coliform counts by MPN method were in the range of 1.3×10 exp (3) to 2.0×10 exp (6) MPN/100㎖, 6.0×10 to 1.3×10 exp (5) MPN/100㎖ respectively. The patterns of their distribution in the 9 sampling sites were similar to that of total bacteria. The fecal streptococci was not discovered in the upper streams and at the sites near urban center its annual average density ranged from 2.1×10 CFU/㎖ to 2.3×10 exp (2) CFU/㎖. The annual average count of Salmonella and Shigella was in the range of 1.5 to 5.7×10 CFU/㎖ and that of yeast was 9.5×10 exp (4) CFU/㎖.