Korean Journal of Soil Science and Fertilizer (한국토양비료학회지)

Korean Society of Soil Science and Fertilizer (한국토양비료학회)
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Relationships between Speciation of Heavy Metals in Soil and Water Dropwort (Oenanthe javanica DC.) Cultivated near Industrial Complex

토양내 중금속 존재형태와 미나리중 함량과의 관계

  • Jung, Goo-Bok (National Institute of Agricultural Science and Technology, Environmental and Ecology Division, RDA) ;
  • Kim, Won-Il (National Institute of Agricultural Science and Technology, Environmental and Ecology Division, RDA) ;
  • Lee, Jong-Sik (National Institute of Agricultural Science and Technology, Environmental and Ecology Division, RDA) ;
  • Kim, Jin-Ho (National Institute of Agricultural Science and Technology, Environmental and Ecology Division, RDA) ;
  • Lee, Jeong-Taek (National Institute of Agricultural Science and Technology, Environmental and Ecology Division, RDA)
  • 정구복 (농업과학기술 환경생태과) ;
  • 김원일 (농업과학기술 환경생태과) ;
  • 이종식 (농업과학기술 환경생태과) ;
  • 김진호 (농업과학기술 환경생태과) ;
  • 이정택 (농업과학기술 환경생태과)
  • Received : 2007.03.28
  • Accepted : 2007.04.18
  • Published : 2007.04.30
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Abstract

This experiment was conducted to investigate heavy metal speciation and bioavailability from soil to the edible parts of water dropwort near industrial complex. The soils and water dropwort were collected from the paddies cultivating water dropwort(10 sites), stream sediments(5 sites), and background soils(3 sites) near industrial complex. The total concentrations of Cd Cu, and Ni were higher than those of permissible level for soil contamination(Cd 3, Cu 100, Ni $50mg\;kg^{-1}$ in soil) suggested by Kloke(1979). Dominant chemical forms of Cd in paddies cultivating water dropwort and stream sediments were exchangeable form(49.1-56.3%), and those of Cu, Zn, and Ni were Fe and Mn oxide bound and residual forms. The mobility factor of heavy metals in paddies cultivating water dropwort and stream sediments was in the order Cd>Zn>Ni>Cu>Pb, specially, the mobility factor of Cd (62-72%) were relatively higher than that of other metals in soils. The total concentrations of Cd in soils showed significant positive correlation with the ratios of exchangeable and Fe and Mn oxide bound forms, while correlated negatively with residual form. Heavy metal contents in root parts were higher than those in top parts of water dropwort. The bioavailability of water dropwort varied considerably between the different parts and heavy metals. Cd, Cu and Ni contents in water dropwort were correlated with each fractions in soils. Specially, the exchangeable form of Cd and Ni in soils showed significant positive correlation with the those contents of water dropwort.

공단인근의 여러 중금속이 복합적으로 오염된 토양에서 중금속의 존재형태와 미나리 중 함량과의 관계를 평가하기 위하여 미나리 재배토양, 농수로 퇴적 저니토 및 대조토양과 동일지점에서의 미나리를 채취하여 분석 검토하였다. 토양의 중금속 총함량 중 Cd, Cu 및 Ni의 평균농도가 Kloke (1979)가 제안한 중금속의 허용한계치를 초과하였다. 중금속별 토양 내 주된 존재형태는 Cd이 치환태였고, 다른 중금속 (Cu, Zn, Ni 및 Pb)은 Fe-Mn 산화물 및 잔류 형태로 나타났다. 재배토양과 농수로 저니토의 형태별 함량에 의하여 환산된 잠재적인 중금속 이동계수는 Cd>Zn>Ni>Cu>Pb 순이였고, 특히 Cd의 경우 대조토양에 비하여 매우 높은 것으로 알수 있었다. 토양의 Cd 전함량과 토양 내 이동성이 높은 치환성 및 Fe-Mn 산화물 분포비율과는 정의 상관, 이동성이 낮은 잔류태와는 부의 상관을 보였다. 미나리 부위별 중금속은 대부분이 뿌리에 축적되었으며, 지상부로의 이행성은 Cd과 Zn가 줄기에서 높았고, Cu와 Ni 함량은 오히려 잎에서 높았다. 토양 중금속 중 Cd, Cu 및 Ni의형태별 함량과 미나리 중 함량과 관련성이 높았고, 특히 치환성 Cd과 Ni 함량은 미나리 중 함량과 고도의 정의상관을 보였다.

Keywords

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