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RISS 인기검색어
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- 저자 : 이건형 ( Soon Woo Hong (검색결과 1 건)
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홍순우,하영칠,안태석,이건형 ( Soon Woo Hong,Young Chil Hah,Tae Seok Ahn,Geon Hyoung Lee ) 한국환경생물학회 1983 환경생물 : 환경생물학회지 Vol.1 No.1
Samples were taken from the surface waters of the main stream of Han river at four designated sites in Seoul city area from September, 1980 to August, 1981. Enumeration of total bacteria and pathogenic bacteria grown on selective media and correlation coefficient with six physico-chemical factors were studied. Temperature distribution showed a regular seasonal cycle and ranged from 0.3℃ to 27℃ during investigation. Every sites of water maintained stable pH values ranged from pH 7.5 to pH 7.7. The oxygen content of the water was, relatively high near Cheon Ho Bridge of site I and lowered along the downstream. The monthly values of oxygen concentration varied between 1.6㎎/ℓ and 12.97㎎/ℓ at all sites. It showed that the oxygen depletion was becoming severe along the downstream. Annual average value of BOD were found to be 2.97㎎/ℓ at site 1, 5.70㎎/ℓ at site 2, 7.85㎎/ℓ at site 3 and 8.84㎎/ℓ at site 4. Annual average concentration of ammonium-N varied between 0.17㎎-at N/l and 2.53㎎-at N/l. The nitrite-N concentrations were relatively high comparing with those which were measured in 1977-1978 by Hong et al., their annual values of concentration varied between 10.84㎍-at N/l and 39.04㎍-at N/l. The concentration of nitrate-N were demonstrated similar values of all sampling sites during investigation and they were in the range of 3.21-3.47㎎-at N/l.? The mean annual values of conductivity varied from 0.72mΩ/㎝ to 0. 88mΩ/㎝. The total bacteria counted by NA media were in the range of 5.5×10 exp (3) - 3.6×10 exp (8) cells/㎖. The population density of total bacteria was highest at site 2 and lowest at site 1. Annual average population density of total coliform and fecal coliform by MPN method were in the range of 8.63×10 exp (3) - 2.41×10 exp (5) /100㎖, 1.39×10 exp (4) - 4.21×10 exp (5) /100㎖, respectively. Enumeration of coliforms by Endo and EC media also showed similar population density comparing with MPN methods. The presence of fecal coliforms in surface water was more accurately correlated with fecal discharges than total coliform group. Mean annual population density of salmonella & shigella groups grown on selective media were in the range of 9.68×10 exp (2) - 5.23×10 exp (3) cells/㎖ and that of streptococci and staphylococci were 3-1.75×10 exp (2) cells/㎖, 1.51×10 exp (2) - 2.79×10 exp (2) cells/㎖, respectively. According to correlation coefficients, fecal coliforms at site 2, site 3 and site 4 might closely relate with domestic waste origin of nitrogen sources.
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