The Korean Journal of Pesticide Science (농약과학회지)

The Korean Society of Pesticide Science (한국농약과학회)
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Translocation of Polychlorinated Biphenyls in Carrot-Soil Systems

Polychlorinated Biphenyl의 작물-토양간 흡수 이행성

  • Lim, Do-Hyung (Department of Bioresources and Food Science, Konkuk University) ;
  • Lim, Da-Som (Department of Bioresources and Food Science, Konkuk University) ;
  • Keum, Young-Soo (Department of Bioresources and Food Science, Konkuk University)
  • 임도형 (건국대학교 생명자원식품공학과) ;
  • 임다솜 (건국대학교 생명자원식품공학과) ;
  • 금영수 (건국대학교 생명자원식품공학과)
  • Received : 2016.06.23
  • Accepted : 2016.08.02
  • Published : 2016.09.30
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Abstract

Polychlorinated biphenyls (PCBs) are ubiquitous environmental contaminants, found in the many environments. PCBs exerts various toxicological effects, including endocrine-disrupting activity. Most researches with these toxicants performed with soil matrix with mixtures of congeners, namely Aroclor, while the biological activities have been tested with animals. However, studies with pure congeners are limited. In this study, 5 congeners were synthesized and their fates (bioaccumulation, degradation, kinetics) were studied in carrot-soil system. The soil half-lives of biphenyl, PCB-1, PCB-3, PCB-77, and PCB-126 were 20.2, 16.0, 11.6, 46.5, 198.0 days, respectively. In general, the longer half-lives were observed with the higher hydrophoicity of PCBs. Times, required for maxium accumulation of PCBs in carrot (Tmax) were 10-20 days for most congeners and the concentrations were 0.4-2.6 mg/kg. The concentrations of PCBs in carrot were kept as constant after Tmax, except PCB-126. The concentration ratio between carrot and soil after 90 days of treatment were 1.7, 8.1, 1.9, 1.8, and 5.9 for biphenyl, PCB-1, PCB-3, PCB-77, and PCB-126. Because of the increase of biomass, the total residual amount of PCBs in carrots however, increased till the end of experiment. The portions of PCB-126 in carrot were 1.1% of the soil residues at 90 days after planting.

Polychlorinated biphenyls는 잔류성 환경 오염물질로서 내생호르몬 대사 교란 효과를 포함한 다양한 생리독성을 나타내는 것으로 알려져 있다. 해당 물질의 환경 동태에 관한 연구는 토양 중, 분해소실과 관련된 연구가 주로 수행되었으며, 한편 생물과 관련 연구는 동물 중, 대사 및 독성 작용에 대한 연구를 대상으로 실시되어 왔다. 이와 같은 연구는 주로 Aroclor 등, 혼합물을 위주로 진행되었으며, 따라서 개별 이성질체에 관한 연구는 매우 제한적으로 수행되었다. 본 연구에서는 수용해도 및 염소 치환체의 위치가 상이한 polychlorinated biphenyl 이성질체 5종을 합성하여, 토양 중 분포 및 당근으로의 이행에 관련한 분해-소실 및 생물농축 과정에 대한 연구를 수행하였다. Biphenyl 및 polychlorinated biphenyl 이성질체의 토양 중 반감기는 biphenyl, PCB-1, PCB3, PCB-77 및 PCB-126에 대하여 각 20.2, 16.0, 11.6, 46.5 및 198.0일이었으며, 지용성이 강한 이성질체일수록, 반감기가 길게 나타났다. 한편 당근 중 biphenyl, 및 polychlorinated biphenyls 농도는 PCB-126을 제외한 시료에서 식재 후, 10-20일 내외에 최고 농도에 도달하여, 0.4-2.6 mg/kg의 농도가 식재 후 90일까지 유지되었으며 당근-토양간 PCB의 농도비는 90일 경과 시료의 경우 biphenyl, PCB-1, PCB-3, PCB-77, 및 PCB-126에 대하여 각각 1.7, 8.1, 1.9, 1.8, 5.9로 나타났다. 일정 경과 시간 후 농도비가 상기와 같이 유지되는 현상은 당근의 비대생장에 따른 희석효과에 따른 것으로 사료된다. 한편 당근에 흡수된 PCBs의 총량은 재배기간 중 지속적으로 상승하여 PCB-126의 경우, 90일 경과시 토양 잔류량 대비, 1.1%가 당근에서 검출되었다.

Keywords

References

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