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이종태(Jong Tae Lee),이진일(Jin Il Lee),남윤규(Yun Gyu Nam),한규흥(Kyu Heung Han) 한국환경농학회 1999 한국환경농학회지 Vol.18 No.2
The water quality of the Keum river was surveyed at 4 sites from April to September in 1995 and 1997. Average values of inorganic contents analyzed in 1997 were pH 7.2, EC 0.18dS/m, NH₄-N 0.60㎎/ℓ, K^+ 4.12㎎/ℓ, Ca^(2+) 12.12 ㎎/ℓ, Mg^(2+) 2.75㎎/ℓ, Na^+ 15.1㎎/ℓ, NO₃-N 1.97㎎/ℓ, PO₄^(3-) 0.15㎎/ℓ, SO₄^- 18.9㎎/ℓ, Cl^- 21.8㎎/ℓ, Fe 0.22㎎/ℓ, COD 19.7㎎/ℓ. On the basis of these values, it was suitable for the irrigation source. Water pH of the Keum river ranged from 6.7 to 8.0. EC of the Daecheong-dam was maintained below 0.13dS/m, but those of the middle and lower stream were ranged from 0.13dS/m to 0.32dS/m. Monthly average values of all the ration contents were the highest in April and were decreased thereafter. And it was slightly increased in September. However NO₃-N, SO₄^(2-) contents were higher in June than any other months. All the inorganic contents were the highest at Taepyeong-ri, Yeongi-gun due to sewage water and livestock wastes. The inorganic contents were negatively correlated with precipitation, generally.