• Title, Summary, Keyword: butyltin

Search Result 44, Processing Time 0.046 seconds

Histological Response of Digestive Gland of Gomphina veneriformis with TBTCl Accumulation in Sediment and Soft Tissue (TBTCl의 저질 및 체내 축적에 따른 대복 Gomphina veneriformis 소화선의 조직학적 반응)

  • Park, Jung-Jun;Park, Jeong-Chae;Kim, Seong-Soo;Cho, Hyeon-Seo;Lee, Yeon-Gyu;Lee, Jung-Sick
    • Environmental health and toxicology
    • /
    • v.24 no.4
    • /
    • pp.341-350
    • /
    • 2009
  • This study involves a relationship between butyltins concentrations and histopathological changes of the digestive gland in the equilateral venus, Gomphina veneriformis exposed to TBTCl of 0.4, 0.6 and 0.8 ${\mu}g/L$ for 36 weeks. In the sediment, total butyltin (${\sum}BT$) concentration was detected ND~7.54 (0.4 ${\mu}g/L$), ND~9.76 (0.6 ${\mu}g/L$), 1.22~13.13 ${\mu}g/L$ (0.8 ${\mu}g/L$), respectively. Especially, TBT level in 0.8 ${\mu}g/L$ group was the highest for 36 weeks. In the soft tissue, total butyltin (${\sum}BT$) concentration of the exposure group was 10.14~12.75 (control), 479.29~1,286.56 (0.4 ${\mu}g/L$), 563.32~2,154.82 (0.6 ${\mu}g/L$) and 1,317.70~2,132.60 ${\mu}g/L$ (0.8 ${\mu}g/L$), respectively. Ratio of TBT to ${\sum}BT$ of the tissue of 0.8 ${\mu}g/L$ kept the lowest level for 36 weeks. The ${\sum}BT$ concentrations of sediment were correlated with ${\sum}BT$ concentrations in the tissue. In the exposure groups, necrosis and atrophy of columnar epithelial cell and collapse of epithelial layer in the digestive tubule. And there was a reduction in stain affinity of basophilic cell. Such histological degenerations was more severe in digestive tubule of 0.8 ${\mu}g/L$ group.

Catalyzed Transesterification Kinetics in Early Stage of Polycarbonate Melt Polymerization (폴리카보네이트 용융중합 초기의 촉매기반 에스터 교환반응 동력학)

  • Jung, Ju Yeon;Lee, Ji Mok;Hong, Sung Kwon;Lee, Jin Kuk;Jung, Hyun Min;Kim, Yong Seok
    • Polymer Korea
    • /
    • v.39 no.2
    • /
    • pp.235-239
    • /
    • 2015
  • In this work, we evaluated catalytic activity of LiOH, $Cu(acac)_2$ and n-butyltin hydroxide oxide hydrate in the early stage of the melt transesterification of isosorbide and bisphenol A as diol monomers and diphenylcarbonate for the melt polymerizaiton of polycarbonate. $Cu(acac)_2$ proved to be the most active catalyst for homopolymerization process, while the catalytic activity of LiOH was higher than the others in case of melt copolymerization depending on the catalytic mechanism and chemical structure of catalyst. We suggested that evaluation of catalytic activity can be used for selection of catalyst system in bio-based copolymerization of polycarbonate.

광양만의 유기주석화합물 오염과 생물농축

  • 심원준;김남숙;임운혁;홍상희;오재룡
    • Proceedings of the Korea Society of Environmental Biology Conference
    • /
    • /
    • pp.25-32
    • /
    • 2002
  • 유기주석화합물은 선박방오도료에 살생물제로 쓰이는 독성이 강한 물질로서 내분비계장애물질의 일종으로 알려지고 있다. 광양만에서 유기주석화합물의 오염현황을 파악하고자 표층퇴적물 및 생물체 중의 농도를 정성 및 정량분석하였으며, 생물에 미치는 영향을 파악하고자 복족류의 임포섹스(암컷에서 수컷의 성기가 발현되는 현상)를 측정하였다. 표층퇴적물 및 생물체 체내에서 phenyltin은 일부 정점을 제외하고는 모두 검출한계 이하의 값을 보였으나, butyltin은 대부분의 정점에서 검출되었다. 표층퇴적물, 참굴, 대수리 체내의 tributyltin (TBT)의 농도는 각각 미검출-29 ng/g, 178-2458 ng/g, 47-236 ng/g 범위를 보였다. TBT 화합물의 공간적인 분포는 선박활동과 밀접한 관련이 있었으며, 항구가 위치한 여수 인근을 제외하고는 광양내만에서 상대적으로 높은 값을 보였다. 한편 대수리 중의 임포섹스는 11개 정점에서 모두 관찰되었으며, 상대성기길이 지수는 47.9-107.8%의 범위를 보였다.

  • PDF

Accumulation of Butyltin Compounds in Shellfish and Fish from Korean Coastal Areas

  • Choi, Hee-Gu;Kim, Sang-Soo;Moon, Hyo-Bang;Lee, Pil-Yong;Gu, Bon-Kyu
    • Journal of the korean society of oceanography
    • /
    • v.37 no.2
    • /
    • pp.82-89
    • /
    • 2002
  • Butyltins (BTs) were measured in 2 species of shellfish and 16 species of fish collected along the Korean coast. Tributyltin (TBT) was detected in the mussels and oysters of sentinel organisms (20 to 940 ng Sn/g dry wt), indicating widespread contamination of TBT in the Korean coast. The elevated concentrations of TBT in the shellfish found in the sites near harbors or shipyards suggested that antifouling paints are probable major sources of butyltins in these areas. The TBT compound was detected in 12 out of 16 fish samples. The concentrations of TBT in fish muscles wee between 7 and 151 ng Sn/g dry wt, while the level in whole body of anchovy was very high (793 ng Sn/g dry wt). Exposure doses to Korean people via consumption of these marine products wee evaluated. The results suggested that the environmental levels of TBT were below the level of concern.

Effects of Trialkyltin in vitro on the Microsomal Monooxygenase System of Digestive Gland in the Clam, Coelomactra antiquata (유기주석화합물이 명주조개 (Coelomactra antiquata)의 약물대사효소계에 미치는 영향)

  • Jeon Joong Kyun;Lee Mee Hee;Kim Do Jin;Shim Won Joon;Oh Jae Ryong;Lee Soo Hyung
    • Korean Journal of Fisheries and Aquatic Sciences
    • /
    • v.35 no.2
    • /
    • pp.185-190
    • /
    • 2002
  • This study was carried out to measure the in vitro interaction of trialkyltin with the microsomal monooxygenase (MFO) system of the clam, Coelomactra antiquata. Cytochrome P450 (CYP) level and 7-ethonvesorufin-O-deethylase (EROD) activity were invetigated in the microsome isolated from digestive gland of the clam (C. antiquata) exposed to tributyltin chloride (TBTC), bis-tributyltinoxide (TBTO) and triphenyltin chloride (TPTC). The specific contents of CYP in clam microsome exposedto 0.4 mM TBTC, TBTO and TPTC for 20 minutes were decreased 52, 72 and $40\%$, respectively, compared to control group. The EROD activities also were inhibited by exposure to TBTO ($92\%$) and TPTC ($85\%$) except for TBTC, The level of CYP and the EROD actintles were decreased according to the OTC exposure concentrations. The toxic effects on the level of CYP and the EROD activities were in order of TPTC>TBTC>TBTO in this study. The measurement of CYP level and EROD activity could be applied as a biomarker for environmental study.

Analysis of Butyltin Compounds and New Antifouling Agents in the Southwestern Korean Tidal flats (한국연안의 갯벌 중에 유기주석화합물 및 새로운 방오도료제의 분석)

  • Lee, Seong-Eon;You, Jae-Bum;Park, Jae-Hong;Lee, Yong-Woo;Won, Ho-Shik;Lee, Dong-Sup
    • Journal of the Korean Society for Marine Environment & Energy
    • /
    • v.11 no.1
    • /
    • pp.1-12
    • /
    • 2008
  • The prohibition of usage of tributyltin (TBT) compounds and the legal usage of new antifouling agents have changed the Korean costal environments in recent. 39 sampling sites of southwestern tidal flats were chosen in order to investigate the concentration of antifouling agents, and results in 2006 were compared with previous results in 1998. The concentrations of TBT compounds in most of sites except Incheon (It1) have been drastically decreased. Interestingly, In Jebudo (Jt2), Mokpo(MOt4) and Suncheon(SUt3) sites were detected as below the limit of detection and it is because of the legal restriction of TBT compounds. However, in most of the sampling sites in Korea, new antifouling agents, viz. Irgarol 1051, Dichlofluanid and Chlorothalonil, were detected. In particular, Irgarol 1051 was detected with high concentrations. In Jebudo (Jt4), a high concentration of Irgarol 1051 of 159.45 ng $g^{-1}$(dry wt) was detected. We were able to observe that the concentration of TBT compounds are has gradually been reduced whereas the new major antifouling agents are easily detected in most Korean tidal flats.

  • PDF

The Spatial Distribution of Harmful Chemical Substance in Sediment Around Busan Southern Port (부산 남항 해저퇴적물 중 유기오염물질 분포 특성에 관한 연구)

  • Min, Byeong-kyu;Lee, Jong-Hyuk;Ju, Mijo;Cho, Chonrae;Cho, Hyeon-Seo
    • Journal of the Korean Society of Marine Environment & Safety
    • /
    • v.26 no.2
    • /
    • pp.206-218
    • /
    • 2020
  • Located mostly inside the megacity of Busan, the Busan Southern Port is a multifunctional port with various nearby industry activities, including a joint fish market, ship repair facilities, and fishing boat facilities. If toxic chemicals generated by the industrial activities continue to flow into and accumulate in the sediment of the port, they can affect aquatic ecosystems and humans. Therefore, in this study, distribution levels and potential influent sources of organic pollutants, including polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), and butyltin compounds (BTs), in the sediment were investigated. The sediment samples were collected from eight sampling sites in November 2013 (first phase) and November 2014 (second phase). The mean concentrations of PAHs, PCBs, and BTs in the first and second sampling phages were 4174.0 ng/g-dry wt. and 1919.0 ng/g-dry wt., 166.3 ng/g-dry wt. and 21 ng/g-dry wt., and 50.9 ng/g-dry wt. and 30.8 ng/g-dry wt., respectively. The concentrations of the organic pollutants detected in the seabed sediments were lower in the second phase than in the first phase. In this study, the inflow sources of PAHs, PCBs, and BTs were found to be combustion, land, and municipal sewage or industrial wastewater, respectively.

Characteristics of Surface Reaction of SnO2 Thin Films Prepared by MOCVD (MOCVD로 제조한 SnO2 박막의 표면반응 특성)

  • Park, Kyung-Hee;Seo, Yong-Jin;Hong, Kwang-Jun;Lee, Woo-Sun;Park, Jin-Seong
    • Korean Journal of Materials Research
    • /
    • v.13 no.5
    • /
    • pp.309-312
    • /
    • 2003
  • Tin dioxide($_SnO2$) thin films were deposited on alumina substrate by metal-organic chemical vapor deposition (MOCVD) as a function of temperature and time. Thin films were fabricated from di-n-butyltin diacetate as a precursor and oxygen as an oxidation. The microstructure of deposited films was characterized by X-ray diffraction and field emission scanning electron microscopy(FE-SEM). The thickness was linearly increased with deposition time and $SnO_2$structure was found from $375^{\circ}C$ for the deposition time of 32 min. The maximum sensitivity to 500ppm CO gas was observed for the specimens deposited at $375^{\circ}C$ for 2 min at the operating temperature of $350^{\circ}C$. Gas sensitivity to CO increased with decreasing the film thickness. The sensing properties of response time, recovery and sensitivity of CO were changed with variations of substrate temperature and time.

Trace Organic Contaminants in Sediments from Deep-sea Basin near Dokdo, Korea

  • Yim, Un-Hyuk;Oh, Jae-Ryoung;Hong, Sang-Hee;Li, Dong-Hao;Shim, Won-Joon;Choi, Hye-Kyung;Kim, Eun-Soo;Shim, Jae-Hyung
    • Ocean and Polar Research
    • /
    • v.24 no.4
    • /
    • pp.391-398
    • /
    • 2002
  • Trace organic contaminants in deep-sea sediments near Dokdo were analyzed. Total PAMs concentration ranged 14.8-314 ng/g dry weight and high molecular weight PAHs were dominant. The highest PAHs concentration was detected at A19 which located at Ulleung Basin. Most of organochlorines were under detection limit. Among the detected organochlorines, DDT compounds were dominant and followed by HCHs and HCB. Butyltin compounds and most of organophosphorus pesticides were not detected. Vertical distribution of PAHs showed typical sub-surface maximum and decreasing trends depending on depth. The highest PAHs concentration reached 454ng/g. Some organochlorines, DDT, HCH was detected and also showed decreasing trends. Other target organic pollutants were not detected in core sediments. Abnormally high level of PAHs concentration in A19 was discussed and the input sources were inferred to be the transport of sludge derived pollutant dumped at dumping site 'Byung' by deep current.

Tributyltin Compound in Sediments and Tissues of Oysters and Rock Shell in Gwangyang Bay, Korea

  • Shim, Won-Joon;Yim, Un-Hyuk;Kim, Nam-Sook;Hong, Sang-Hee;Oh, Jae-Ryoung
    • Korean Journal of Environmental Biology
    • /
    • v.22
    • /
    • pp.63-70
    • /
    • 2004
  • Tributyltin (TBT) and its degradation products, dibutyltin (DBT) and monobutyltin (MBT) were quantitatively determined in surface sediments and two molluscan species, Pacific oyster (Crassostrea gigas) and rock shell (Thais ctavigera), from Gwangyang Bay, Korea. Butyltin compounds were detectable in almost all sediment and biota samples. Tributyltin concentrations in surface sediment ranged<2∼33 ng g$\^$-1/, which is at a lower end of TBT concentrations in industrialized bays in Korea. However, TBT levels in sediments were related to boating activities around the bay. In biota samples, TBT concentrations were in the range of 178∼2,458 ng g$\^$-1/ toy oyster and 47∼236 ng g$\^$-1/ for rock shell. Relatively high TBT concentrations in biota were found near wharves for fisherboats and harbor areas. About 90∼100% of the female T. clavigera displayed imposex, and relative penis length index of the imposexed-female was in the range of 20.9∼107.9%. Furthermore, TBT body residue had a significant positive relationship with degree of imposex in T. clavigera. Overall, TBT concentrations in Gwanyang Bay were much lower than other major bays in Korea.