• Title/Summary/Keyword: Hazardous materials

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Evaluation of analytical methods for several metals and fluoride by certified reference materials (인증표준물질을 이용한 중금속류와 플루오르화물 전처리방법 비교 연구)

  • Jeon, Tae Wan;Chung, David;Shin, Sun Kyoung;Choi, Hun Geun;Chung, Young Hee
    • Analytical Science and Technology
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    • v.19 no.2
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    • pp.172-180
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    • 2006
  • This study was performed to establish new methods for hazardous substances and to develop an analytical method in specified wastes for preventing the environmental pollution caused by hazardous wastes. Therefore, the trends of international management, regulatory criteria, and items of hazardous wastes in various countries were investigated. Based on this study, target priority of new hazardous substances in specified wastes was established. An analytical method was developed using the waste standard reference materials of sludge, oil, bottom ash, etc., which contain the new hazardous substances (Ba, Be, Cr(VI), F, Ni, Sb, Se, and V). A total of 37 waste samples from the representative facilities, which are emitting new hazardous substances, were analyzed.

Performance Evaluation of Protective Clothing Materials for Welding in a Hazardous Shipbuilding Industry Work Environment (조선업의 유해 작업환경 대응을 위한 용접 보호복 소재의 성능평가 연구)

  • Kim, Min Young;Bae, Hyun Sook
    • Fashion & Textile Research Journal
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    • v.15 no.3
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    • pp.452-460
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    • 2013
  • This study conducted a performance evaluation of protective clothing materials used for welding in a hazardous shipbuilding industry work environment. The welding process was selected as the one that most requires industrial protective clothing according to work environment characteristics. Flame proofing and convection heat protection performance (HTI) in the heat transfer characteristics of protective clothing material were indicated in the order of SW1(Oxidant carbon)>SW2(silica coated Oxidant carbon)>SW4(Oxidant carbon/p-aramid)>SW3(flame proofing cotton). However, radiant heat protection performance (RHTI) and the heat transfer factor (TF) were indicated in the order of SW1>SW4>SW2>SW3 and showed different patterns from the convection heat protection performance. SW1 showed superior air permeability and water vapor permeability. The tensile strength and tear strength of welding protective clothing material were indicated in the order of SW4>SW2>SW3>SW1 and showed that a blend fabric of p-aramid was the most superior for the mechanical properties of SW4. SW1 had excellent heat transfer properties in yet met the minimum performance requirements of tensile strength proved to be inappropriate as being a material for welding protective clothing. The abrasion resistance of woven fabric proved superior compared to nonwoven fabric; however, seam strength and dimensional change both met the minimum performance requirements and indicated that all samples appeared non-hazardous. Finally, oxidant carbon/p-aramid blend fabric appeared appropriate as a protective clothing materials for welding.

Understanding Three-dimensional Printing Technology, Evaluation, and Control of Hazardous Exposure Agents (3D 프린팅 기술의 이해, 유해 인자 노출 평가와 제어)

  • Park, Jihoon;Jeon, Haejoon;Oh, Youngseok;Park, Kyungho;Yoon, Chungsik
    • Journal of Korean Society of Occupational and Environmental Hygiene
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    • v.28 no.3
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    • pp.241-256
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    • 2018
  • Objectives: This study aimed to review the characteristics of three-dimensional printing technology focusing on printing types, materials, and health hazards. We discussed the methodologies for exposure assessment on hazardous substances emitted from 3D printing through article reviews. Methods: Previous researches on 3D printing technology and exposure assessment were collected through a literature review of public reports and research articles reported up to July 2018. We mainly focused on introducing the technologies, printing materials, hazardous emissions during 3D printing, and the methodologies for evaluation. Results: 3D printing technologies can be categorized by laminating type. Fused deposition modeling(FDM) is the most widely used, and most studies have conducted exposure assessment using this type. The printing materials involved were diverse, including plastic polymer, metal, resin, and more. In the FDM types, the most commonly used material was polymers, such as acrylonitrile-butadiene-styrene(ABS) and polylactic acids(PLA). These materials are operated under high-temperature conditions, so high levels of ultrafine particles(mainly nanoparticle size) and chemical compounds such as organic compounds, aldehydes, and toxic gases were identified as being emitted during 3D printing. Conclusions: Personal desktop 3D printers are widely used and expected to be constantly distributed in the future. In particular, hazardous emissions, including nano sized particles and various thermal byproducts, can be released under operation at high temperatures, so it is important to identify the health effects by emissions from 3D printing. Furthermore, appropriate control strategies should be also considered for 3D printing technology.

Development of Species-Specific PCR to Determine the Animal Raw Material (종 특이 프라이머를 이용한 동물성 식품원료의 진위 판별법 개발)

  • Kim, Kyu-Heon;Lee, Ho-Yeon;Kim, Yong-Sang;Kim, Mi-Ra;Jung, Yoo Kyung;Lee, Jae-Hwang;Chang, Hye-Sook;Park, Yong-Chjun;Kim, Sang Yub;Choi, Jang Duck;Jang, Young-Mi
    • Journal of Food Hygiene and Safety
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    • v.29 no.4
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    • pp.347-355
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    • 2014
  • In this study, the detection method was developed using molecular biological technique to distinguish authenticity of animal raw materials. The genes for distinction of species about animals targeted at Cytochrome c oxidase subunit I (COI), Cytochrome b (Cytb), and 16S ribosomal RNA (16S rRNA) genes in mitochondrial DNA. The species-specific primers were designed by that Polymerase Chain Reaction (PCR) product size was around 200 bp for applying to processed products. The target 24 raw materials were 2 species of domestic animals, 6 species of poultry, 2 species of freshwater fishes, 13 species of marine fishes and 1 species of crustaceans. The results of PCR for Rabbit, Fox, Pheasant, Domestic Pigeon, Rufous Turtle Dove, Quail, Tree Sparrow, Barn Swallow, Catfish, Mandarin Fish, Flying Fish, Mallotus villosus, Pacific Herring, Sand Lance, Japanese Anchovy, Small Yellow Croaker, Halibut, Jacopever, Skate Ray, Ray, File Fish, Sea Bass, Sea Urchin, and Lobster raw materials were confirmed 113 bp ~ 218 bp, respectively. Also, non-specific PCR products were not detected in compare species by species-specific primers. The method using primers developed in this study may be applied to distinguish an authenticity of food materials included animal raw materials for various processed products.

The Comparison of Volatile Organic Compounds (VOCs) Analysis and Tradescantia Micronucleus (Trad-MCN) Bioassay for Evaluation of Hazardous Materials in Chemical Workplace Field (화학공장 실내 작업장에서의 유해물질 평가를 위한 VOC 분석법과 자주달개비 미세핵 분석법의 비교)

  • Heo, Gwi Suk;Lee, Jae Hwan;Shin, Hae Shik;Kim, Jin Kyu;Lee, Young Yup;Lee, Dai Woon;Lee, Jin Hong
    • Analytical Science and Technology
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    • v.16 no.1
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    • pp.1-11
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    • 2003
  • This research examined the presence of hazardous materials in chemical workplace field using an integrated chemical/biological monitoring. Chemical workplace field air for volatile organic compounds (VOCs) analysis was collected using a collection tube packed with Tena.x TA adsorbent 400 mg. Workplace field air samples were analyzed by gas chromatography/mass spectrometry (GC/MS). Simultaneously, Tradescantia BNL 4430 clone was exposed in situ to monitor hazardous materials in chemical workplace field. GC/MS analysis showed the presence of various VOCs such as trichloroethylene, toluene, ethylbenzene, (m,p,o)-xylenes, styrene, 1,3,5-trimethylbenzene, and 1,2,4-trimethylbenzene. The results showed that in situ monitoring of VOCs with the Tradescantia-micronucleus (Trad-MCN) assay gave positive results in chemical workplace field and negative response at outdoor air. In conclusion, inhalation of these field air by workers may affect chronic demage to their health by inducing micronuclei formation in Tradescantia pollen mother cells. The combination of chemical/biological monitoring is very effective to evaluate hazardous materials in workplace field and can be alternatively used for screening hazardous materials.

Estimation of Sodium Hydroxide Waste Origin-Destination Matrices for Preventing Hazardous Material Transportation Disasters

  • Kim, Geun-Young;Jung, Tae-Hwa;Kim, Sang-Won
    • Journal of the Korean Society of Hazard Mitigation
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    • v.9 no.1
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    • pp.73-79
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    • 2009
  • Hazardous materials (HazMats) are substances that are flammable, explosive, toxic, or harmful, if released into the environment. Since the transportation of HazMats increases in many developed countries, HazMat transportation has the key function in the process of HazMat usage to trace information of production, storage, shipment, usage, and waste disposal. The Korean Ministry of Environment (KMOE) and the National Emergency Management Agency (NEMA) have developed many laws, regulations, and standards for hazardous materials. However, the Korean HazMat laws, regulations, and standards do not guarantee accurate information of HazMat origin-destination (O-D) shipments, though the HazMat O-D movement is the critical information in safety and security of HazMat transportation. The objectives of this research are: (1) to investigate emerging and recurrent issues in Korean HazMat transportation, and (2) to develop the estimation method of O-D matrices for hazardous materials under limited data sets. The sodium hydroxide waste shipment among forty candidate HazMats is selected as the sample research case. The growth-factor method is applied to estimate the 2005 O-D matrix of sodium-hydroxide waste shipment. The column-and-row factoring process is used to calibrate the estimated sodium-hydroxide O-D matrix. The result shows the applicability of the O-D estimation process for hazardous materials. The Sodium Hydroxide Waste Origin-Destination Matrix is obtained to trace routes and paths of the Sodium Hydroxide transportation.

A Comparative Study on Risk Management Systems for Hazardous and Noxious Substances at Sea, in Korea and USA. (해상 위험.유해물질 위험관리제도의 비교연구 - 한국과 미국 중심으로 -)

  • 최종해
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.8 no.1
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    • pp.15-52
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    • 2002
  • According to International Maritime Organization. more than 50% of cargoes transported by sea today can be regarded as dangerous or hazardous ones, mainly consisting of chemical cargoes in bulk, likely solid or liquid and other materials, such as gases and products for and of the oil refinery industry. 46% of total cargoes handled in ports of Korea in 1999. is said to be dangerous cargoes. These dangerous and hazardous cargoes are quite within a high realms of possibility of accidents, likely to be grave disaster. This paper reviews current risk management system for the dangerous and hazardous cargoes sea-transportation, mainly focusing on the prevailing regal regimes in both USA and Korea. And it aims to suggest some points for advancing the existing Korean system.

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A Study on Knowledge Representation for Recognizing Hazardous States in Chemical Processes (화학공정의 위험상태 인식을 위한 지식 표현에 관한 연구)

  • 안대명;황규석
    • Journal of the Korean Society of Safety
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    • v.11 no.3
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    • pp.104-111
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    • 1996
  • A system was developed that could predict hazardous states for safe operation of chemical plants. This system aimed to prevent hazards of chemical processes from misoperation before real operation. In this study, a data base was organized which consisted of all hazards in the chemical processes. The structure of process was represented by signed direct graph(SDG) of NODEs and ARCs. Each NODE and ARC have property variables ; connected structure and state of processes etc. The hazards that could be occurred in processes were divided into two classes ; one is by operation of unit and the other is by hazardous materials. Using Hazardous States Transition Network, we could recognize transition progress of process states.

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A Study on the Effect of Damages on the Conditions of Dike in the Leakage of Hydrochloric Acid Storage Tank (염산 저장탱크 누출 시 방류벽 조건에 따른 피해영향 연구)

  • Kang, Jungchun;Kim, Seungha;Kim, KyuHwan;Kim, YeonSoo;Kwon, Donguk
    • Korean Journal of Hazardous Materials
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    • v.6 no.2
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    • pp.7-12
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    • 2018
  • Hydrochloric acid is a highly corrosive toxic substance and requires proper safety to minimize damage in case of leakage. Among the various risk-reduction facilities, the dike is a typical safety facility installed to protect the surrounding buildings and facilities by preventing the external spread of hazardous materials from the storage tank. In this study, the KORA program was used to assume leakage accident of hydrochloric acid storage tank. At this time, the extent of the damage effects of ERPG-2 were assessed for each of the three separation distance between the storage tank and the dike. The study found that the smaller the separation distance between the dike and the storage tank, the smaller the extent of damage caused by hydrochloric acid leakage, and the greater the impact of indoor conditions under the same conditions. Through this process, we are going to assist in selecting locations and installing facilities for new and existing businesses.

Performance Evaluation of Molten Metal Splash Protective Fabrics (용융금속 방호보호복소재의 성능수준 평가)

  • Park, Pyoung-Kyu;Jin, Lu;Yoon, Kee-Jong
    • Korean Journal of Hazardous Materials
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    • v.6 no.2
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    • pp.55-61
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    • 2018
  • In this study, the molten metal protective performance of various molten metal protective clothing materials such as herringbone twill laminated aluminium foils, oxydized-polyacrylonitrile laminated with aluminium deposited polyethylene terephthalate films, twill fabric laminated with aluminium deposited polyethylene terephthalate films and nonwoven laminated with aluminum deposited polyethylene terephthalate films, were evaluated according to modified EN ISO 9185. The results showed that the molten metal protective performance of tested samples improved with the increase in fabric structure density, weight and thickness. In addition the effect of the thickness of aluminum foil on the molten metal protective performance is not significant. It was found the fabric is more important in the molten metal splash protective clothing.