Korean Journal of Soil Science and Fertilizer (한국토양비료학회지)

Korean Society of Soil Science and Fertilizer (한국토양비료학회)
권호 표지

Long-term Changes in Polycyclic Aromatic Hydrocarbon Content of Paddy Soils in Youngnam area

영남지역 논토양에서 다핵방향족탄화수소 농도의 장기변동

  • 남재작 (농업과학기술원 농업환경부) ;
  • 홍석영 (농업과학기술원 농업환경부) ;
  • 이희동 (농업과학기술원 농산물안정성부) ;
  • 박창영 (작물과학원 영남농업연구소) ;
  • 이상학 (경북대학교 화학과)
  • Received : 2007.03.30
  • Accepted : 2007.05.27
  • Published : 2007.06.30
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Abstract

This study was to determine long-term changes of polycyclic aromatic hydrocarbons (PAHs) in paddy soils. To do this, we analyzed 16 PAHs in soil samples which were stored in the archive of Yeoungnam Agricultural Research Institute, Milyang, Kyeoungnam province, Korea. The samples used in this study were collected every year from 1978 to 2001 at the plough layer (0-12cm). In average, total PAHs accumulated in paddy soil was continuously decreased since 1980 when it peaked to be $237g\;kg^{-1}$. No significant changes were observed for PAHs having 5-6 phenyl rings for the past two decades, whereas PAHs with 3-4 phenyl rings were greatly decreased, reaching at about a half levels of the 1980's. It is worthy to be noted that the large reduction in PAHs with 3-4 phenyl rings has mainly been attributed to the decrease of PAHs in paddy soils for last 20 years. The major compounds accumulated were: phenanthrene > fluoroanthene > chrysene/benzo(b)fluoroanthene. The present results suggest that the switch of main fuels used in Korea from coal to petroleum around at the end of 1970's is likely contributed to decrease in PAH accumulation in paddy soils.

영남농업연구소에 보관된 토양 시료의 분석결과 밀양지역 논토양에서의 PAHs 함량 1978년 이후 지속적으로 감소되고 있는 것으로 나타났다. 1978년에 $200{\mu}g\;kg^{-1}$을 넘어서 1980년에 최고농도($237{\mu}g\;kg^{-1}$)에 달하였으나, 이후 지속적으로 감소하여 2001년에는 $100{\mu}g\;kg^{-1}$ 수준까지 감소하였다. 이상의 결과는 PAHs의 발생원이 적은 지역의 농경지에서는 1980년대 이후 대체적으로 PAHs의 농도가 감소하고 있고, 오염물질(PAHs)의 대기이동에 의한 토양오염의 우려가 비교적 낮다는 것을 시사한다.

Keywords

References

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