• Title, Summary, Keyword: Perfluorinated compounds

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The Study of Emulsion System Containing with Perfluorinated Compounds (PFCs) (Perfluorinated Compounds (PFCs) 안정화 시스템의 연구)

  • Choi, Bong-Ki;Cho, Hee-Won;Kim, Hyo-Jung;Lee, Joo-Dong
    • Journal of the Society of Cosmetic Scientists of Korea
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    • v.33 no.4
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    • pp.239-243
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    • 2007
  • When Perfluorinated Compounds (PFCs) are applied in cosmetic products, they have many merits because of unique feeling and characters. However, it is very difficult to use them as cosmetic ingredients because they are insoluble material in oil and water and have high specific gravity. To develop a special system to stabilize PFCs in cosmetic products, we compared three systems, of gel network system, spherulite lamellar system, and nanostructure system. We found that nanostructure system was the optical system for stabilizing PFCs.

Analytical trend of perfluorinated compounds in environmental and biota samples (환경 및 생체시료 중 과불화 화합물의 분석 동향)

  • Lee, Won-Woong;Chang, Won-Hee;Pyo, Hee-Soo;Kang, Tae-Seok;Hong, Jong-Ki
    • Analytical Science and Technology
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    • v.23 no.4
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    • pp.331-346
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    • 2010
  • Perfluorinated compounds have characteristics of resistance to heat, acidic, basic conditions and also resist water, oil, grease, pollutant. Futhermore they are used by various industrial material, nowadays, they produced in large scale for indutrial and commercial areas. However, they also resist metabolizing and degrading in environmental system (plant, animal, even human body). Moreover, in animal's bodies, PFCs can be accumulated in organ (eg; liver) and lead to liver cell necrosis even oncogenesis. Perfluorinated compounds are newly registered as new persistent organic pollutants (POPs) on Stockholm convention in 2009. Therefore necessity for analytical methodology for determination of PFCs in various environmental samples is even more increased. This study discussed sample preparation and instrumental conditions for the analysis of PFCs in environmental and biota samples.

Regioselective 1,3-Dipolar Cycloaddition and 1,2-Addition between Benzaldoxime NH-nitrone and Perfluoro-2-methyl-2-pentene

  • Lee, Chan-Woo;Park, Joo-Yuen;Kim, Hyun-Uk;Chi, Ki-Whan
    • Bulletin of the Korean Chemical Society
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    • v.31 no.5
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    • pp.1172-1176
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    • 2010
  • Regioselective perfluorinated [3+2] cycloadducts and 1,2-adducts have been prepared by 1,3-dipolar cycloaddition between benzaldoxime NH-nitrone and perfluorinated alkene, perfluoro-2-methyl-2-pentene. Although the cycloaddition reaction is carried out at room temperature, the corresponding perfluorinated compounds are effectively produced in a high yield. In particular, the methoxy-substituted adducts (4 and 7a) show the self-assembled structure by intermolecular interactions. These derivatives were characterized by IR, $^1H$ and $^{19}F$ NMR, and the absolute structure of perfluorinated adducts was confirmed by X-ray crystallography.

Synthesis of Perfluorinated Heterocyclic Compounds Having a Long Alkyl Chain Functionality by 1,3-Dipolar Cycloaddition

  • Lee, Chan-Woo;Hwang, Ho-Yun;Park, Joo-Yuen;Chi, Ki-Whan
    • Bulletin of the Korean Chemical Society
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    • v.31 no.5
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    • pp.1305-1308
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    • 2010
  • Regioselective perfluorinated isoxazolidine (5 and 7), isoxazoline (9) and 1,2-addition products (6 and 8) having a long alkyl chain functionality have been prepared by 1,3-dipolar cycloaddition between a 1,3-dipole (NH-nitrone or nitrile oxide) and dipolarophile (perfluoro-2-methyl-2-pentene or styrene), respectively. Interestingly, unusual extended conjugated form of isoxazoline adduct (10) was obtained by dehydrofluorinated reaction from the corresponding perfluorinated isoxazoline adduct (9) which was derived from cycloadition between the perfluorinated long alkyl nitrile oxide 1,3-diplole and styrene olefin. This synthetic methodology of heterocyclic compound having a long alkyl chain functionality is useful for the designing of synthetic strategy and potential self-assembled monolayers (SAM) application. These derivatives were characterized by IR, $^1H$ and $^{19}F$ NMR, and MASS analysis.

Bioconcentration of Perfluorinated Compounds in Fish from Gulpo Stream (굴포천에 서식하는 어류체내 과불화화합물 농축특성)

  • Cho, Chon-Rae;Cho, Jae-Gu;Eom, Ig-Chun;Lee, Byoung-Cheun;Kim, Sue-Jin;Choi, Kyung-Hee;Yoon, Jun-Heon
    • Environmental Analysis Health and Toxicology
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    • v.25 no.3
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    • pp.229-240
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    • 2010
  • During the last decade, perfluorinated compounds (PFCs) have gained more attention due to their toxicity and global distribution. The aim of this study was to examine the distribution and bioaccumulation of perfluorinated compounds (PFCs) in aquatic wildlife effected from a sewage treatment plant. The concentrations of 12 PFCs were determined in water, sediment and fish samples. PFOS were predominantly detected in both ambient environment and fish. In fish, the concentration of PFCs in blood was the highest (i.e., 112.47 ng/mL wet-wt. PFOS) in comparison to other tissues. However, PFOA and PFHpS were highly detected in gonad as 3.87 and 4.58 ng/g wet-wt., respectively. The bioconcentration factor (BCF) of PFCs was greatest in the blood > liver${\cong}$gonad > kidney > gill, and lowest in the muscle tissue. The BCFs of PFUnDA (39,000), PFDA (2,700) and PFOS (1,100) were rated as high values based on wet weight concentration. BCFs increased with increasing the length of the perfluoralkyl chain.

The Preparation of Perfluorinated Organometallic Compounds via Vinyllithium Compounds of Alicyclic 1,2-Dihalopolyfluoroolefins (Alicyclic 1,2-디할로폴리플루오르올레핀으로 부터 비닐리튬 화합물과 Perfluorinated 유기금속화합물의 합성)

  • Joseph D. Park;Choi Sam Kwon
    • Journal of the Korean Chemical Society
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    • v.17 no.4
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    • pp.286-297
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    • 1973
  • Polyfluorocycloalkenyllithium compounds have been prepared by exchange reaction with 1,2-dihalopolyfluorocycloalkenes and alkyllithium reagents. Their reactions with mercuric, arsenic and dimethyl germanium halides are described and the chemistry of these compounds discussed.

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Perfluorinated Compounds; New Challenge and Problem (과불화 화합물 (PFCs); 새로운 도전과 과제)

  • Son, Hee-Jong;Yoo, Soo-Jeon;Roh, Jae-Soon
    • Journal of Korean Society of Environmental Engineers
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    • v.31 no.12
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    • pp.1151-1160
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    • 2009
  • Perfluorinated compounds (PFCs) have been recognized as emerging environmental pollutants and are widely distributed all over the world. These compounds are hardly degradable and cause bioaccumulation and biomagnification during present for a long time in the environment: thereby after adversely biota and human bodies. It is difficult to remove PFCs using conventional water/wastewater treatment because of resistant property to photodecomposition, biodegradation and chemical decomposition. Moreover, domestic literature data on the pollution of PFCs in rivers and lakes are limited. In this paper, species, sources and risk of PFCs as well as behavior properties in drinking water/wastewater and treatment processes are demonstrated to encourage the domestic concern about PFCs.

Distribution and Risk Assessment of Perfluorinated Compounds (PFCs) in Major Drinking Water Treatment Plants, Korea (국내 주요 정수장의 과불화화합물 분포 및 위해성 평가)

  • Son, Boyoung;Lee, Leenae;Yang, Mihee;Park, Sangmin;Pyo, Heesoo;Lee, Wonsuk;Park, Juhyun
    • Journal of Korean Society of Water and Wastewater
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    • v.31 no.6
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    • pp.491-499
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    • 2017
  • The chemical structures of perfluorinated compounds(PFCs) have unique properties such as thermal and chemical stability that make them useful components in a wide variety of consumer and industrial products. Two of these PFCs, perfluorooctane sulfonate(PFOS) and perfluorooctanoic acid(PFOA), have received attention and were the most commonly detected. In this study it was analyzed the concentrations of 8 PFCs in samples were collected from drinking water treatment plants for 5 years(2012-2016). PFOS and PFOA were also high concentration and frequency. The mean concentrations of PFOA and PFOS were detected $0.0026-0.0069{\mu}g/L$ and $0.0009-0.0024{\mu}g/L$ in samples from drinking water treatment plants. These were relatively lower or similar compared to PFOS concentrations in Osaka(Japan). In general, these levels are below health-based values set by international authoritative bodies for drinking water. These results will be serve as the first monitoring data for PFCs in drinking water and be useful for characterizing the concentration distribution and management of PFCs in future studies.

Application of On-Line SPE-LC/MSD to Measure Perfluorinated Compounds (PFCs) in Water (On-Line SPE-LC/MSD 시스템을 이용한 수중의 과불화 화합물(PFCs) 분석)

  • Son, Hee-Jong;Yoom, Hoon-Sik;Jung, Jong-Moon;Jang, Seung-Ho
    • Journal of Korean Society of Environmental Engineers
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    • v.35 no.2
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    • pp.75-83
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    • 2013
  • We applied a sensitive method based on on-line solid-phase extraction (SPE) and liquid chromatography/mass spectrometry (LC/MSD) using an electrospray interface for the determination of eleven perfluorinated compounds (PFCs) in water. The on-line connection suppressed the target loss by keeping the cartridge from drying, which resulted in improvement of the recovery and saving of the analytical time. For the on-line solid-phase extraction of 10 mL water samples, recoveries were between $80.4{\pm}5.2%{\sim}109.5{\pm}1.4%$ and limit of quantification (LOQ) were 3.6~15.9 ng/L for the PFCs. The total PFCs concentrations of the tributaries and main stream of Nakdong River water samples were in the range of $8.0{\sim}678.6{\mu}g/L$.

The Evaluation of Adsorption Characteristics of Perfluorinated Compounds (PFCs) in GAC Process Using Continuous Column Adsorption Test (연속 컬럼흡착 실험을 이용한 GAC 공정에서의 과불화 화합물(PFCs) 흡착 특성 평가)

  • Son, Hee-Jong;Yoo, Soo-Jeon;Jang, Seung-Ho
    • Journal of Korean Society of Environmental Engineers
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    • v.35 no.3
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    • pp.206-212
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    • 2013
  • This study accessed the adsorption characteristics of the 11 perfluorinated compounds (PFCs) on coal-based granular activated carbon (GAC). The breakthrough appeared first for PFODA and sequentially for PFHDA, PFTeDA, PFTDA, PFDoDA, PFUnDA, PFDA, PFNA, PFOA, PFOS, and PFHpA. The maximum adsorption capacity (X/M) for the 11 PFCs with apparent breakthrough points ranged from 2.43 ${\mu}g/g$ (for PFODA) to 64.5 ${\mu}g/g$ (for PFHpA). Carbon usage rate (CUR) for PFODA was 0.291 g/day, 11.2 times higher than that for PFHpA (0.026 g/day). The X/M values for the 11 PFCs were fitted well with a linear regression ($r^2$ = 0.89) by their molecular weight (chain length).