• Title, Summary, Keyword: dioxins

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A floor pattern and mixing characteristic analysis to design the equipment for reducing the dioxins (먼지ㆍ활성탄 접촉형 다이옥신류 저감장치내 유동 해석)

  • 최상민;구윤서;윤균덕;조주생;강병춘
    • Proceedings of the Korea Air Pollution Research Association Conference
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    • pp.207-208
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    • 2001
  • 1990년 이후 생활폐기물보다 사업장 폐기물이 많아지면서 총 폐기물 발생량은 점차 증가하고 있는 상황이다. 날로 증가하는 폐기물을 국내 실정상 매립처리하는 것은 한계가 있으므로, 효율적인 감량화 정책으로 폐기물 발생량을 저감하고, 소각에 의한 처리가 요구된다. 그러나 폐기물 소각처리는 소각 재와 유해가스를 배출하기 때문에 많은 문제점이 있다. 특히 인체에 맹독성인 다이옥신류(polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans:PCDD/Fs)가 배출되면서 현재 사회적 문제로 크게 부각되고 있기 때문에 소각시 다이옥신을 처리할 수 있는 장치의 개발이 필요하다. (중략)

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GENE EXPRESSION PROFILE OF HUMAN MAMMARY EPITHELIAL CELLS IN RESPONSE TO 2,3,7,8-TETRACHRODIBENZO-p-DIOXIN

  • Ahn, Nam-Shik;Park, Joon-Suk;Cho, Eun-Hye;Seo, Min-Soo;Nyuen ba Tiep;Lee, Young-Soon;Kang, Kyung-Sun
    • Proceedings of the Korean Society of Toxicology Conference
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    • pp.145-145
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    • 2002
  • 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) is a prototype and the most potent chemical of the polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (dioxins). A variety of studies on the toxic effects of dioxin and related compounds have been conducted internationally since 1990.(omitted)

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Vertical Distribution of Persistent Organic Pollutant in Core Sediments from Upo Wetland (자연습지 우포늪 퇴적물의 연도별 잔류성 유기오염물질 축적도)

  • Boo, Min Ho;Lee, Chan Won;Lee, Sang Chun;Kim, Jong Guk;Jeon, Hong Pyo;Kim, Ki Ho;Choi, Kyung Hee;Yun, Jun Hun;Jeong, Mi Jung
    • Journal of Wetlands Research
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    • v.10 no.2
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    • pp.23-37
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    • 2008
  • The vertical distribution of dioxins and hexachlorobenzene(HCB) in a sediment core was investigated to elucidate historical trends of dioxins and HCB deposited into Upo wetland. The total concentration of dioxin ranged from 8.7 to 66.27 pg/g-dw in Upo sediments deposited, and from 17.64 to 97.03 pg/g-dw in Mokpo. Dioxin fluxes increased from the first-1990s and then reached a maximum in the mid-1990s. The major source of dioxin by comparing the congeners pattern was pentachlorophenol(PCP) used of agrochemicals. The HCB concentration in most of samples was detected below the MDL(Method Detection Limit of 0.5ng/g), except a few samples.

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Levels and Patterns of Polychlorinated Dibenzo-p-dioxins and Dibenzofurans in Sediments from Korean Coast

  • Moon Hyo-Bang;Choi Hee-Gu;Kim Sang-Soo;Jeong Seung-Ryul;Lee Pil-Yong
    • Fisheries and aquatic sciences
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    • v.4 no.2
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    • pp.51-57
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    • 2001
  • Polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs) were measured in sediment samples from 19 stations in the coastal areas of Korea from February to July 2000. PCDDs and PCDFs were detected in all sediment samples. The concentrations of these con­taminants ranged from 18.2 to 804.0 pg/g dry weight and I-TEQ concentrations varied from 0.1 to 5.5 pg/g dry weight. Examination of homologue groups showed that octachlorinated dibenzo-p-dioxin (OCDD) was predominant congener in Korean coast. This pattern was similar to homologue profiles of marine sediments in which the main source of PCDDs/DFs was derived from the atmospheric deposition of particulate matters generated from various industrial activities. Grain size and total organic carbon (TOC) distribution are one of the important factors governing PCDDs/DFs concentration in this study.

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Risk-based Priority Ranking for Air Pollution Problems in Seoul (서울 지역에서 인체 위해도에 입각한 대기오염물질의 관리 우선 순위 선정에 관한 연구)

  • 김예신;박화성;이용진;임영욱;신동천
    • Journal of Korean Society for Atmospheric Environment
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    • v.19 no.2
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    • pp.205-216
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    • 2003
  • We have gathered exposure data on ambient air quality level and investigated dose-response slope factors of air pollutants such as fine particle, HAPs (metals, VOCs, PAHs) and dioxins in Seoul. Theoretical mortality incidences were estimated from exposure to these pollutants. From the results, priorities were ranked in the order fine particle, metals, VOCs, dioxins and PAHs by ordinal scale, and the uncertainties relative to those risk estimates were described.

Formation of Pyro-products by the Pyrolysis of Monobromophenols

  • Na, Yun-Cheol;Seo, Jung-Ju;Hong, Jong-Ki
    • Bulletin of the Korean Chemical Society
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    • v.24 no.9
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    • pp.1276-1280
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    • 2003
  • Thermal behavior of bromphenols was investigated by direct pyrolysis at high temperature. The thermal degradation products formed by the pyrolysis of mono-bromophenols (o-, m-, and p-) were identified by gas chromatography-mass spectrometry. During the pyrolysis reactions, several kinds of dioxins and furans were produced, and the relative ratio of pyro-products was dependent on the substituted position of bromine in phenolic structure due to the effect of symmetry and steric hindrance. The formation of dioxins can be explained by the phenoxy radical addition and Br atom elimination at an ortho-carbon site on phenolic structure. On the other hand, the formation of furans can be explained by the ortho-ortho carbon coupling of phenoxy radicals at unsubstituted sites to form o, o'-dihydroxydiphenyl intermediate via its keto-tautomer, followed by $H_2O$ elimination. The pyrolysis temperature has also a substantial effect on the dimerized products quantities but little effect on the type of pyro-products. Moreover, the formation mechanism of pyro-products was suggested on the basis of products identified.