Relation between COD and organic ions
...lated to the concentration sodium ion which might be derived from NaCl of city sewage. This result was fascinate enough for us to make another assumption which the major organic contamination of Wonju stream and Sum river is city sewage. If this assumption is correct, the TOC, BOD or COD values should be increased directly proportionally to the increase of sodium and chloride ion concentrations but not to the other ions. Water samples from 12 different sites of Wonju stream and Sum river area were obtained at dry season of May 2002. Na, Mg, K, Ca, Pb, Hg ions and Cl, SO4, PO4 ions were selected for cation and anion respectively, and the concentration were determined. TOC, BOD, CODMn and CODCr values were also carefully measured. Sum river is one of a branch of upper area of south Han river. The water of Sum river is eventually reached to Paldang which has been used for drinking water source of Seoul-national capital with 10 milliion population. Wonju stream penetrate Wonu city and passed thru cultural area as well as factory area. From a glance view, Wonju stream considered to have various contaminating source but indeed, benomyl - one of the most popular pesticide - was not detected over MDL. According to the nature of the factories in Wonju area, organic contaminating material was not released a lot to Wonju stream. These info...