이 연구는 한·중·일이 각각 선포한 배타적 경제수역이 중첩되는 수역의 법적 성격과 연안국 및 기국의 권리와 의무를 분석한다. Ⅱ장에서는 한·중·일의 배타 적 경제수역의 선포와 연안국 간 잠정어업협정 체결로 형성된 법적 사실관계를 정리하고, 해당 수역을 배타적 경제수역(EEZ), 잠정적 공동관리 구역 (provisional joint regulation zones), 유보 수역(reserved waters)으로 분류하여, 분쟁수역이 배타적 경제수역과 공해의 이중적 성격을 갖는다는 결론의 전 제를 도출한다. Ⅲ장에서는 분쟁수역이 배타적 경제수역 또는 공해로서의 이중적 법적 성격 을 갖는 근거를 제시하고, 분쟁수역에 대한 배타적 경제수역과 공해의 법리 적 용 논거를 통해 연안국 및 기국의 권리와 의무를 쟁점 사안별로 검토한다. 특 히, 공해의 법리가 적용되는 논거에서는 UN해양법협약상 배타적 경제수역의 공해적 특성과 분쟁수역의 특성에 따른 공해의 법적 성격을 구분하여 살펴본 다. 해당 수역의 잠재적 법적 성격을 분석함으로써 동북아시아 내의 분쟁수역 에 대한 구체적 이해에 기여한다.

The formation potential and pathway of less-chlorinated PCBs, including mono- and di-chlorinated biphenyls, was investigated when PCBs contained in transformer oil were dechlorinated by commercial treatment. Potassium hydroxide with polyethylene glycol (PEG-600) was used for dechlorination of PCBs, and its destruction efficiency to whole 209 congeners of PCBs was 97.1% on average, ranging from 95.6% to 98.2%. Homologue of mono-CBs showed the negative destruction efficiencies, while those of highly-chlorinated ones through tri- to deca-CBs showed better efficiencies than about 99%. In particular, mono-chlorinated biphenyl in meta-position (#2) was about 34-47 times enriched after dechlorination, thus the reactivity seemed to be in the order of ortho-, para-, and meta-chorinated biphenyl. Co-planar PCBs' dechlorination efficiency was averaged as high as 99.4%, but 3,4,4',5-TeCB (#81) showed a relatively lower efficiency than others' in one case. Not only sodium metal but also alkaline metal such as potassium was thought of affecting the formation or enrichment of mono-chlorinated biphenyls produced by Wrutz-Fittig reaction as intermediates and products.

The dechlorination processes and efficiencies of PCBs contained in transformer dielectric oils were investigated on three commercial-treatment companies. Alkaline dispersion method was used for dechlorination of PCBs mainly using molten metallic sodium or potasium hydroxide with PEG, and its dechlorination efficiency to whole congeners of PCBs was 98.94% on average. Homologues of highly-chlorinated biphenyls showed better efficiencies than those of less chlorinated ones, especially mono-chlorinated biphenyl in para-position (#2) was about 37 times enriched after chemical treatment. Co-planar PCBs' dechlorination efficiency was averaged as high as 99.78%, but 3,3',4,4'-TeCB was relatively low as 96.5%. It was suggested for better dechlorination efficiency to remove the water in transformer oil prior to chemical reaction and to stir the reagents more rapidly when using alkaline dispersion method.