Unit Loadings of Heavy Metals by Non-point Sources - Case Study in a Valley Watershed -

비점원에 의한 중금속 원단위 부하량 - 곡간지 유역을 중심으로 -

  • Kim, Jin-Ho (Div. of Environment & Ecology, National Institute of Agricultural Science and Technology, RDA) ;
  • Han, Kuk-Heon (Rural Agricultural Infrastructure and Resources, Rural Research Institute) ;
  • Lee, Jong-Sik (Div. of Environment & Ecology, National Institute of Agricultural Science and Technology, RDA)
  • 김진호 (농촌진흥청 농업과학기술원 환경생태과) ;
  • 한국헌 (한국농촌공사 농어촌연구원 생산자원연구소) ;
  • 이종식 (농촌진흥청 농업과학기술원 환경생태과)
  • Published : 2008.03.31


The study was carried out to estimate runoff loads of heavy metals in the valley watershed at the middle of South Korea, during farming season. There were no other pollution sources except agricultural activity. From 27 April 2006 to 31 October 2007, water samples were collected using two methods. The first method was regular sampling wherein water samples were taken every two weeks; and the other method was through regular sampling when water were collected during each rainfall event. Results showed that heavy metals were found in the water from the regular samples, and were highest during May and June. It was presumed that this might have been contributed by farming activities. Heavy metal concentration of the irregular samples was lower than regular samples. The correlation coefficient between each heavy metal of the regular samples were as follows: Fe-Al>Cr-Al>Fe-Cr>Mn-Fe. The correlation coefficient of the irregular samples were the following: Fe-Al>Fe-Cu is positive; and Pb-Cu>Ni-Al is negative. Measured pollutant loads of heavy metals in the valley watershed were : 2.047 kg $day^{-1}$ of Al, 0.008 kg $day^{-1}$ of Cd, 0.034 kg $day^{-1}$ of Cr, 0.311 kg $day^{-1}$ of Cu, 0.601 kg $day^{-1}$ of Fe, and 0.282 kg $day^{-1}$ of Zn in 2006; while in 2007, the following were observed: 2.535 kg $day^{-1}$ of Al, 0.026 kg $day^{-1}$ of Cd, 0.055 kg $day^{-1}$ of Cu, 0.727 kg $day^{-1}$ of Fe, and 0.317 kg $day^{-1}$ of Zn. In the analysis of data gathered, the loading rates of effluents from the valley watershed during the rainy season were : 79.8% of Al, 69.1% of Cu, 82.5% of Fe, and 69.1% of Zn in 2006; while 69.9% of Al, 67.5% of Cu, 70.4% of Fe, and 67.5% of Zn in 2007.


Heavy metals;Unit pollutant loads;Correlation;Valley watershed


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