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이영한,김종균,이한생,조동진,조주식,신원교 ( Young Han Lee,Jong Gyun Kim,Han Saeng Lee,Dong Jin Cho,Ju Sik Cho ) 한국환경농학회 1997 한국환경농학회지 Vol.16 No.3
To investigate chemical changes of agricultural water in Nam river used for the basic information. Samples were collected from seven sites along the Nam river and were analyzed for inorganic content from April to September in 1994∼1995. Average value of analyzed inorganic concentrations at seven sampling sites were pH 7.9, COD 7.3㎎/ℓ, NO₃-N 1.2㎎/ℓ, Na^+ 6.2㎎/ℓ, Cl^- 14.8㎎/ℓ, EC 0.13dS/m, PO₄^(3-) 0.21㎎/ℓ, K^+ 2.6㎎/ℓ, Ca^(2+) 10.8㎎/ℓ, Mg^(2+) 2.9㎎/ℓ, SO₄^(2-) 10.5㎎/ℓ, Fe^(3+) 0.03㎎/ℓ and Zn^(2+) 0.02㎎/ℓ. The monthly average value of COD, NO₃-N, Na^+ and Cl^- showed highest peak in July 8.4∼11.6, 1.1∼1.7, 5.4∼13.1 and 18.9∼27.9㎎/ℓ. The highest region of average COD, NO₃-N, Na^+ and Cl^- were Weola pumping station, 8.8∼11.3, 1.6∼2.4, 9.0∼10.2 and 21.7∼23.0㎎/ℓ. The ionic copmposition(ΣA/ΣC : ratio between total equivalant of anions and canon) of Nam river was higher at Weola pumping station than other topography. The EC was positively correlated with K^+, Ca^(2+), Mg^(2+), Na^+, Cl^- and SO₄^(2-).
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