• Title, Summary, Keyword: PCBs

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Chemical Dechlorination Process of PCBs in Industrial Transformer Oil: Approach to Practical Use (변압기 오일 내 PCBs의 화학적 탈염소공정: 실용적인 접근)

  • Ryoo, Keon-Sang;Byun, Sang-Hyuk;Choi, Jong-Ha
    • Journal of Environmental Science International
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    • v.18 no.9
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    • pp.953-959
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    • 2009
  • A practical and efficient disposal method for chemical dechlorination of PCBs (polychlorinated biphenyls) in transformer oil was evaluated. The transformer oil containing PCBs was treated by the PEG 600 (polyethylene glycol 600) and potassium hydroxide (KOH) along with different reaction temperatures(25, 50, 100 and $150^{\circ}C$) and times(30, 60, 240 and 480 min). The best disposal efficiency of PCBs in transformer oil was attained under the experimental conditions of PEG 600 (2.5 w/w%)/KOH (2.5 w/w%)/$150^{\circ}C$/4 hrs, showing completely removal of all PCBs containing 3-9 chlorines on two rings of biphenyl. In studying the reaction of PEG/KOH with PCBs, it confirmed that the process led to less chlorinated PCBs through a stepwise process with the successive elimination of chlorines.

Determination of byproducts after treatment in PCBs-containing transformer oils (PCBs 함유 절연유의 처리 후 부산물 배출특성 연구)

  • Shin, Sun Kyoung;Park, Jin Soo;Kang, Young Yeul;Hwang, Seung Ryul;Kim, Young Sik
    • Analytical Science and Technology
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    • v.21 no.3
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    • pp.201-211
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    • 2008
  • The treatment efficiency of PCBs containing wastes has been investigated. The samples treated by electron beam and de-chlorination method were analyzed to verify the byproducts before treatment and after treatment. In the treated samples by electron beam irradiation, PCBs were not detected by comparing the peak matching using the Korean official waste test method. On the other hand, PCBs congeners were detected by analyzing individual isotope method using HRGC/HRMS. Most of PCB congeners in waste were decomposed to 3-chlorobiphenyls, lower chlorinated congener produced during the treatment of electron beam. In the chemical dechlorination treatment, it was found that the concentrations of PCBs in treated samples were lower than those of regulation criteria in Waste & POPs management law and the after treatment concentration were satisfied to the regulation criteria. Also, dioxins were not observed after the physio-chemical treatment processes of PCBs containing wastes.

The Distributions of PCBs in Inchon Coastal Sediments (인천연안 퇴적물 중 PCB의 분포)

  • Lee, Dong Hoon;Kim, Kyeo Keun
    • Analytical Science and Technology
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    • v.15 no.3
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    • pp.287-299
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    • 2002
  • The residue levels of total PCBs in the surface samples were detected low concentration compared to the coastal area in Korea, and the PCBs pattern were very similarly to the arochlor mixture(1016+1232+1248+1260). The selected area divided into three area(Kanghwa:A, Yellow:B and Jangdo:C) by depending on the chlorine ratio. The PCBs were mainly detected dichlorinated and trichlorinated biphenyls in far sea, and heptachlorinated and octachlorinated biphenyls in the near the Incheon coastal area. The residue levels of PCBs were detected 0.72${\sim}$9.20 ng/g in the surface samples, 1.60~3.00 ng/g for Kanghwa and 0.34~9.20 ng/g for Jangdo in the core samples, and the PCBs concentration increased from bottom to top.

Determination of Polychlorinated Biphenyls in the Soil by Perchlorination (염소화법에 의한 토양 중 Polychlorinated Biphenyls의 잔유분석)

  • Moon, Moon, Chul-Ho;Choi, Choi, Sang-Ki;Kim, Kim, Jung-Ho
    • Journal of Environmental Science International
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    • v.4 no.3
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    • pp.249-258
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    • 1995
  • PCBs have been measured using GC-ECD, GC-MS, GC-ELCD, HPLC, TLC, NMR and Immunoassay. The analysis of PCBs using GC-ECD include the peak pattern method as none derivatization and the Perchlorination method as derivatization. This study was conducted to establish the perchlorination method with Sbcls from PCBs to decachlorinated biphenyl(DCB). The aroclor 1242 of PCBs was chlorinated and then, converted into the DCB which showed a single peak in GC-ECD chromatogram. The detection limit of DCB was 2pg. The quantification detection concentration of PCBs extracted with soxhlet was 0.5ng/g in the soil. PCBs were not detected in the suburban soil, but 174ng/g in the soil of industrial complex. Mean PCBs concentration of Shinchun stream at Kumho river and Jinchun stream at Nakdong river was calculated average 낙ngjg in 각e sediment. PCBs concentration in the sediment of Kumho river near 2-7km from conjunction with Nakdong river was average 154ng/g. PCBs concentration in the sediment of Nakdong river near conjunction with Kumho river was average 159ng/g.

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Concentration Characteristics of PCBs in Pine Needle and Soil at Rural Area (교외지역에서 소나무 잎과 토양 중 PCBs의 농도 특성)

  • Shin Eun-Sang;Yeo Hyun-Gu
    • Journal of environmental and Sanitary engineering
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    • v.21 no.1
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    • pp.1-11
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    • 2006
  • This study was to investigate concentration characteristics of atmospheric PCBs in soil sample and pine needle at rural area. Profiles of PCB congener detected in pine needle and soil sample have a difference that low molecular PCBs mainly existed in pine needle, whereas high molecular PCBs were mainly existed in soil sample because of their different vapor pressure and octanol-air partitioning coefficient($K_{OA}$) of each congeners. Correlation coefficients(r) of PCB congeners simultaneously detected in soil and pine needle were significant (r>0.71, p<0.01), which showed that PCB congeners patterns of atmosphere could be estimated in using pine needle and soil sample indirectly. The contributions(%) of higher molecular PCBs(>penta-CB) to total PCBs in soil sample were higher than those of pine needle and the contribution of lower molecular PCBs(

Quantiflcation of Human Exposure and Analysis of PCBs in Contaminated Some Site (특정지역에서 토양중 PCB의 분석과 인체노출량평가)

  • 이효민;박송자;김명수;윤은경;최시내;김선태;박종세
    • Toxicological Research
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    • v.13 no.1_2
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    • pp.49-54
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    • 1997
  • PCBs are classified as B2 (Probable human carcinogen) based on the induction of hepatocellular carcinomas in rats and mice from IRIS (Integrated Risk Information System). About 20 years ago, PCBs were phased out for electrical use in Korea, but PCBs were continuously used in the other field. Lately, there has been increasing concern on possible effects of contaminated soil to the other environment and human health. The purpose of this study is to determine PCBs level in soil at some site and to assess the human exposure doses according to exposure routes for people living within sites which expected to be exposed to PCBs. Pollution level of PCBs on the site was monitored using gas liquid chromatography. To assess the transport of PCBs in soil to plant and to air, various transfer factors(diffusion coefficient, bioconcentration factor etc.) were considered in simple calculations. To calculate the residential exposure doses by routes, some equations were considered using assumption value, which define inhalation, ingestion (soil, plant) and derreal uptake pathway. Computated results will be used as risk assessment information for human health evaluation on contaminated soil.

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The State-of-the-Art on Technologies for Treatment of Polychlorinated Biphenyls(PCBs) Pollutants (잔류성 유기오염물질 Polychlorinated Biphenyls(PCBs) 분해 처리 기술 현황)

  • Lee, Sang-Hoon;Sea, Bongkuk
    • Clean Technology
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    • v.11 no.1
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    • pp.29-39
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    • 2005
  • Polychlorinated biphenyls, (PCBs) are a group of highly toxic chlorinated industrial chemicals used as dielectrics, coolants and lubricants in electrical transformers. This article reviewed the state-of-the-art on technologies for decomposition of Polychlorinated biphenyls (PCBs), one of the persistent organic materials (POPs). The purpose of this study was to evaluate the feasibility of decontaminating PCBs contaminated pollutants using treatment technologies such as chemical dechlorination, photodegradation and biological transformation.

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Changes of Hepatic Microsomal Cytochrome P450 Monooxygenase System in Nile tilapia, Oreochromis niloticus Exposed to PCBs (PCBs노출에 의한 틸라피아, Oreochromis niloticus의 간 cytochrome P450 효소계의 변화)

  • KANG Ju-Chan;CHO Kyu-Seok
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.34 no.3
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    • pp.194-198
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    • 2001
  • The study was conducted to investigate the changes of hepatic cytochrome P450 monooxygenase system induced by dietary administration of polychlorinated biphenyls (PCBs) in the tilapia, Oreochromis niloticus. Tilapia were fed pellet with PCBs (Aroclor 1254) 0.05, 0.25 and 0.50 mg/kg body weight/day for 30 days. The dietary administration of PCBs (0.05 mg/kg) induced a significantly increased the concentration of cytochrome P450 and the activity of 7-ethoxyresorufin-O-deethylase (EROD) in the hepatopancreas at 30 days, while the augmentation of both responses was found at 20 days with a higher administration of PCBs-diet (0.25 mg/kg). However, hepatic 7-penthoxyresorufin-O-dealkylase (PROD) activity did not show any noticeable changes with the PCBs-diet 0.05-0.5 mg/kg range compared to control group during the experimental periods of 30 days in the tilapia. These results indicate that tilapia fed PCBs at the concentration of more than 0.05 mg/kg for 30 days are affected by PCBs in terms of cytochrome P450 concentration and EROD activity in the hepatopancreas.

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Analytical method of the polychlorinated biphenyls in soil using GC/ECD and GC/MS (GC/ECD 및 GC/MS을 이용한 토양 중 PCBs 분석방법 고찰)

  • Kim, Tae-Seung;Shin, Sun-Kyoung;Yoon, Jeong-Ki;Kim, Jong-Ha;Kim, Hyoung Seop;Lee, Jeong Ah
    • Analytical Science and Technology
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    • v.20 no.2
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    • pp.91-108
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    • 2007
  • This study was investigated both the Korean official soil test method and the international various methods for PCBs in soil sample. The analytical guideline of PCBs in contaminated soil were proposed based on the official soil test methods by discussing the extraction, column cleanup, instrumental conditions, quantification methods of peak matching and individual isomers. The total 28 soil samples were selected by consideration of PCBs-contamination, land use etc., and then analyzed using gas chromatography/electron capture detection (GC/ECD) and gas chromatography/mass spectrometry(GC/MS). In this study, the PCBs were not detected as peak matching method using GC/ECD, but PCBs detected $0.002{\sim}0.487{\mu}g/kg$ using GC/MS in background concentrations.

Remediation of Soil Contaminated with Persistent Organic Pollutants through Subcritical Water Degradation (아임계수 분해를 이용한 난분해성 물질로 오염된 토양의 정화 연구)

  • Choi, Jae-Heon;Lee, Hwan;Lee, Cheol-Hyo;Kim, Ju-Yup;Oh, Seok-Young
    • Journal of Korean Society of Environmental Engineers
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    • v.37 no.2
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    • pp.113-119
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    • 2015
  • This study examined remediation of soil contaminated with polychlorinated biphenyls (PCBs) and other persistent organic pollutants by using subcritical water. Our results showed that removal efficiency of PCBs from soil and treatment temperature were linearly proportional under subcritical conditions. The removal efficiency as increased as reacting period increased. PCBs contaminating fine particles in soil were less effectively removed than those in entire contaminated soil. Reaction of the zero-valent iron and PCBs under subcritical condition produced dechlorinated product, where most of the PCBs were oxidised while little remained as dechlorinated. Other organic pollutants, such as TPH, BTEX, TCE/PCE, and chlorpyrifos, were removed by more than 90% at $300^{\circ}C$. Considering removal efficiency and identification of by-products, we suggest that subcritical water treatment may be effectively applied to soils contaminated with various persistent organic pollutants.