earticle

영어

This study was carried out to identify the major cause of sediments pollution in urban area. The six sediment samples were analyzed the organic and heavy metal with sediments of different particle size ranges. The prepared sediment samples were obtained after drying the separated with sieve as follows : >1,000 ㎛, 1,000~850 ㎛, 850~500 ㎛, 500~300 ㎛, 300~250 ㎛, 250~125 ㎛, 125~75 ㎛, 75~45 ㎛, and < 45 ㎛. The analyzed water quality constituents for graded sediments were chemical oxygen demand(COD), total nitrogen(TN), total phosphorus(TP), heavy metals (Fe, Cu, Cr, Fe, and Pb). The results indicate that most of particle size ranges of the contamination sediments was 250~125 ㎛, and portion of below 45 ㎛ was low. But most of the pollutants are associated with the finer fractions of the load sediments. As the results of analysis, the range and average values of COD, TN, TP, Fe, Cu, Cr, and Pb were 24,892~50,568 mg/kg, 353~543 mg/kg, 617~1,066 mg/kg, and Fe 1,410~2,725 mg/kg, Cr 21.50~51.99 mg/kg, Cu 12.96~84.48 mg/kg, and Pb 15.70~127.20 mg/kg, respectively. The results showed that the highest concentration site was commercial area. The relationship between sediment size and pollutants concentration have an inverse proportion. The removal of contamination sediments with frequently could be reduced the significant nonpoint pollutant load, because of the urban sediments contains considerable micro-particles and heavy metals.