NOM Characteristics and Turbidity In-flow in Lake Soyang

The purpose of this study was to elucidate the turbidity in-flow in lake Soyang and the characteristics of natural organic matter(NOM). The NOM analysis was performed by Liquid Chromatography-Organic Carbon Detection (LC-OCD) which is a kind of high-performance size-exclusion chromatography (HPSEC) with nondispersive infrared (NDIR) detector and UV detector. There is a no correlation between turbidity and humic substances (HS) concentration in upstram of lake Soyang but turbidity correlation (r = 0.98) is very good with suspended solids (SS). The results of aromaticity and humification indicated that the NOM in Naerin stream and Inbuk stream originated from pedogenic fulvic acids. The NOM of lake Soyang also was originated from pedogenic fulvic acids. It indicated that rainfall event brought pedogenic fulvic acids in to lake Soyang from upper stream rather than aquagenic fulvic acids from algae. The portion of HS from lake Soyang was 1,003 /L on the average. It can be comparable to Nakdong river so careful treatment is required in the water treatment precess to minimize the concentration of disinfection byproducts(DBPs).