Risk Assessment of As, Cd, Cu and Pb in Different Rice Varieties Grown on the Contaminated Paddy Soil

중금속 오염 논토양에서 재배된 벼 품종간 위해성평가 비교

  • 김원일 (국립농업과학원 유해물질과) ;
  • 김진경 (국립농업과학원 유해물질과) ;
  • 류지혁 (국립농업과학원 유해물질과) ;
  • 백민경 (국립농업과학원 유해물질과) ;
  • 박상원 (농촌진흥청 연구정책국) ;
  • 권오경 (국립농업과학원 유해물질과) ;
  • 홍무기 (국립농업과학원 유해물질과) ;
  • 양재의 (강원대학교 자원생물환경학과) ;
  • 김정규 (고려대학교 환경생태공학부)
  • Received : 2009.01.15
  • Accepted : 2009.02.08
  • Published : 2009.02.28

Abstract

Heavy metal pollution may be one of the most serious challenges confront crop production and human health. Therefore, the selection of heavy metal tolerance cultivars which adapted to the contaminated fields will introduced a suitable solution for management this critical environmental risk. The objectives of this research is to assess human health risk using geochemical analyses and exposure assessment of heavy metals in rice cultivars. Risk for inhabitants in the closed mine area was comparatively assessed for As, Cd, Cu and Pb in 10 rice varieties as a major exposure pathway. The average daily dose (ADD) of each heavy metal was estimated by analyzing the exposure pathways to rice and soil. For the non-carcinogenic risk characterization, Hazard Quotient (HQ) and Hazard Index (HI) were calculated using toxicity indices provided by US-EPA IRIS. The different rice varieties revealed a wide range of HI values from 23.6 to 34.3, indicating that all rice varieties have a high potential toxic risk. The DA rice variety showed the lowest HI value while the TB rice variety the highest. The probabilities of cancer risk for As via rice consumption were varied with rice varieties ranging from 2.0E-03 to 3.5E-03 which exceeded the regulatory acceptable risk of 1 in 10,000 set by US-EPA. The DA rice variety also showed the lowest value while the TB rice variety gave the highest value. Our results indicate that risk assessment can be contribute to screen the pollution safe rice cultivars in paddy fields affected by the mining activity.

Keywords

Human risk assessment;Rice;Variety;Paddy soils

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