• Title/Summary/Keyword: Hazard material

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Degradation of the Herbicide Butachlor by Laboratory-synthesized Nanoscale $Fe^0$ in Batch Experiments

  • Kim, Hyang-Yeon;Kim, In-Kyung;Han, Tae-Ho;Shim, Jae-Han;Kim, In-Seon
    • Journal of Applied Biological Chemistry
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    • v.49 no.3
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    • pp.101-105
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    • 2006
  • Degradation of the herbicide butachlor was investigated using laboratory-synthesized zerovalent iron ($Fe^0$). The synthesized zerovalent iron was determined to be nanoscale powder by scanning electron microscopic analysis. To investigate degradation of butachlor using the synthesized nanoscale zerovalent iron, time-course batch experiments were conducted by treating the solution of butachlor formulation with the iron. More than 90% degradation of butachlor was observed by iron treatment within 24 h. The synthesized nanoscale zerovalent iron showed an increase in particle aggregation in the batch tests. Green rust formation and a pH drop in solutions were observed, suggesting that the oxidation of the iron occurred. When the iron was extracted with dichloromethane, a negligible concentration was found in the extract, suggesting that butachlor did not bind to the iron particles. GC/MS analysis detected the dechlorinated product as a major degradation product of butachlor in the solutions. The data indicate that laboratory-synthesized zerovalent iron functioned as a reductant to remove electron-withdrawing chlorine, giving the dechlorinated product.

Study on the Analysis of PCBs in Papers by the Peak Pattern Method (피크패턴법을 이용한 종이재의 PCBs 분석 방법에 관한 연구)

  • 김기명;유승석;이광호
    • Journal of Food Hygiene and Safety
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    • v.14 no.1
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    • pp.67-75
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    • 1999
  • The new approach using the Peak Pattern Method was conducted for the analysis of polychlorinated biphenyls (PCBs) from the papers or paper products to provide certain hygienic data for the recycled papers as well as white papers. The height of the each peak, obtained from the PCBs standards, was transformed to the spectrum to compare with that of the samples. In addition to the results of the single PCBs standards, the pattern of mixed PCBs standards with the adequate concentration and ratios were obtained prior to the analysis of the paper samples. The test showed excellent repetition within 5% variation, and the recoveries of PCBs ranged from 92% to 97%. The PCBs, considered as a hazard material, were analyzed using the Peak Pattern Method from six different types of paper samples including the roll tissue. It could not find the same pattern of the PCBs peaks from all of the paper samples.

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Development of Real-time Safety Management System for Incident Prevention by Hazard Material Transport (위험물 운송사고 예방을 위한 안전관리시스템 개발)

  • Kim, Yeon Woong;Kim, Si Gon
    • Journal of the Korea Safety Management & Science
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    • v.17 no.3
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    • pp.105-113
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    • 2015
  • The incidents related to transporting hazardous materials may cause serious impacts on neighborhood and surrounding areas. It is essential to have a real-time safe management system for incidents prevention of transporting hazardous materials. Currently, the system is not integrated into one channel, which makes it difficult to control an incidents response. Another problem is that event status is not appropriately shared among authorities having responsibilities taking down the incidents. This paper investigates previous studies covering the real-time safety management system for hazard material transports and suggests an integrated management system that helps communicate effectively and promptly.

Removal of Arsenic from Leachate of Tailing using Laboratory-synthesized Zerovalent Iron

  • Kim, Soon-Oh;Jung, Young-Il;Cho, Hyen-Goo;Park, Won-Jeong;Kim, In-Seon
    • Journal of Applied Biological Chemistry
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    • v.50 no.1
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    • pp.6-12
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    • 2007
  • Feasibility of laboratory-synthesized zerovalent iron was investigated to remove arsenic from leachates of tailings taken from an Au-Ag abandoned mine. The tailings were seriously contaminated with arsenic, and its potential adverse effect on the ecosystems around the mine seems to be significantly high. Long-term column experiments were conducted for about 3.5 months to evaluate the effectiveness of the synthesized zerovalent iron for removal of arsenic. Over than 95% removal efficiency of As was observed in the zerovalent iron mediated tests. In addition, the XRD data suggest that the corrosion products of ZVI were identified magnetite, maghemite, goethite, and lepidocrocite, all of which support Fe(II) oxidation as an intermediate step in the zerovalent iron corrosion process. The results indicate that arsenic can be removed from the tailing-leachate by the mechanism of coprecipitation and/or adsorption onto those iron oxides formed from ZVI corrosion.

A Study on the Assessment of Hazardous Properties of the Chemicals (화학물질의 위험성평가에 관한 연구)

  • Lee, Bong-Woo;Park, Chul-Woo;Song, Haak;Choi, Jeong-Soo
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • pp.262-269
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    • 2008
  • Chemical products have had an favorable influence on our everyday life, and contributed very much to the development of human culture. According to the rapid change of industry and the development of scientific technique the using chemical products are increasing more and more. Chemical products can have any hazardous property such as flammability or explosiveness. There are occurring many accidents in the international trade due to the different classification and labelling of chemicals produced in various countries. The main purpose of this work is the development of global standard test methods for the chemicals, and the classification and labelling in building block approach by means of the basic technical data. Oxidizing solids, combustible solids, spontaneously combustible materials, water-prohibitive materials, flammable liquids, self-reactive materials and oxidizing liquids have been tested. The results have been classified according to the hazard material safety regulation and the UN regulation, and summarized in a data-base.

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A useful reliability evaluation method for the environmental material (환경물질에 대한 사용 신뢰성평가 방법에 관한 연구)

  • 이종범;조재립
    • Journal of the Korean Society for Quality Management
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    • v.31 no.4
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    • pp.226-238
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    • 2003
  • Recently, The problems with which our country's company is confronted for business of manufacturing goods. This study set the hypothesis to develop the method that was analysis and application of A reliability evaluation method of environmental material for circuit components in Computer, Color TV, Monitor, Microwave oven, Electric Refrigerator, Automobile parts, other goods. Especially, this study emphasis on regulate export of the EU and North America that it's a environmental material's hazards problem. In this process, this study set the pattern of practical application. Therefore, this study emphasis on the application of A reliability evaluation method of environmental material and the use of other parameters by environmental reliability test data. The result of this study is as follows. 1) There is relationship between regulate material and technical protecting system. 2) Characteristics of hazard materials is operating a healthcare damage factor as well as regulate environmental factors.

RoHS management and product reliability ensure method for the environmental preservation (환경보호를 위한 RoHS 관리와 제품신뢰성 확보 방안)

  • Lee, Jong-Beom;Cho, Jai-Rip
    • Proceedings of the Korean Society for Quality Management Conference
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    • pp.362-369
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    • 2007
  • This study set the hypothesis to develop the method that was analysis and application of a reliability evaluation method of environmental material for the Computer, Color TV, Monitor, Microwave oven, Electric Refrigerator, Automobile parts, other goods. RoHS management and product reliability ensure method for the conservation of environment. Especially, this study emphasis on regulate export of the EU and North America that it's a environmental material problem. Therefore, this study emphasis on the application of a reliability ensure method of environmental material and the use of other parameter by environmental reliability test data. The result of this study is as follows. 1) There is relationship between regulate material and technical protecting system. 2) Characteristics of hazard material is operating a healthcare damage factor as well as regulate environmental factors.

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Critical Issues on Health Risk of Asbestos (석면과 건강에 대한 이슈)

  • Yoon, Chung-Sik
    • Journal of Environmental Health Sciences
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    • v.35 no.5
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    • pp.426-432
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    • 2009
  • Asbestos is a commercial term of natural occurring silicated minerals and forms long, thin fibers. Chrysotile, the serpentine asbestos, accounts for most use in commercial use. Asbestos is well known health hazard material and it is proved that inhalation of asbestos fibers leads to increased risk of developing several diseases such as lung cancer, mesothelioma, asbestosis. In these days, people most at risk for exposure are maintenance and construction workers and general citizens who are working on and close to the work area at which asbestos containing material is disturbing. Non asbestiform, though its chemical composition is same with regulated asbestos, is known to be less hazardous than asbestiform. Exposure guideline, 0.01 f/ml, is not safe level in terms of health risk. It is reasonable to take preventable action when asbestos is suspicious. In Korea, it is necessary to clarify the concept between hazard and risk, to differentiate asbestiform from non asbestiform, to make regulations for compensation for asbestos related patients, to manage future exposure for general citizens.

A Comparative Study on the Risk(Individual and Societal) Assessment for Surrounding Areas of Chemical Processes (화학공정 주변지역에 미치는 위험성(사회적 위험성 및 개인적 위험성) 평가방법에 관한 비교 연구)

  • 김윤화;엄성인;고재욱
    • Journal of the Korean Society of Safety
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    • v.10 no.1
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    • pp.56-63
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    • 1995
  • Two methods of the numerical method of CPQRA(Chemical Process Quantitative Risk Analysis) and the manual method of IAEA(International Atomic Energy Agency) were used to estimate the individual risk and societal risk around the chemical plant. Where, the CPQRA is introduced to verify the theoritical background of the manual of international atomic energy agency. The Gaussian plume model which has a weather stability class D with velocity of 5m/s was applied to calculate dispersion of hazard material. Also, 8-point method was employed to the effects of accidents for wind distribution. Furthermore, historical record, FTA(Fault Tree Analysis) and ETA(Event Tree Analysis) were used to estimate the probability or frequency of accidents. Eventually, the individual risk shows isorisk contour and the societal risk shows F-N curve around hazard facility, especially in chemical plants. Caulculated results, which both individual and societal risk, by using IAEA manual show simillar results to those of calculation by numerical method of CPQRA.

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