• 제목/요약/키워드: Chemical Substances

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Manufacture and Properties of Inorganic Chemical Treated Wood by Introducing of Fluorides

  • Kim, Soung-Joon;Lee, Jong-Shin
    • Journal of the Korean Wood Science and Technology
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    • 제36권2호
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    • pp.73-78
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    • 2008
  • Inorganic chemical treated wood was prepared by impregnation of calcium or magnesium chloride ($CaCl_2$ or $MgCl_2$) solution and immersion in saturated solution of ammonium fluoride ($NH_4F$) as a reactant in order to make an introduction of a refractory fluorides with fungicidal and insecticidal effects in wood. The weight percent gains (WPGs) were increased with increase in concentration of calcium chloride or magnesium chloride solution, and were higher in treatment with calcium chloride than with magnesium chloride. Inorganic substances were produced mainly in the lumina of tracheides. These substances were proved to be the calcium fluoride or magnesium fluoride by the energy dispersive X-ray analyzer in conjunction with a scanning electron microscope (SEM-EDX). The treated wood showed good decay resistance because the weight losses were hardly occurred by the test fungi such as Tyromyces palustris and Trametes versicolor. The fire resistance effect was superior to the treated wood compared with that of the untreated wood.

On-line SPE-HPLC Method using Alumina Filtering to Selectively Extract Phenolic Compounds from Environmental Water

  • Lee, Sung-Kwang
    • Bulletin of the Korean Chemical Society
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    • 제31권12호
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    • pp.3755-3759
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    • 2010
  • A on-line SPE (solid phase extraction)-HPLC preconcentration method was developed for the determination of phenolic compounds at trace levels in environmental water sample. XAD-4 and Dowex 1-X8 were used as sorbent in the on-line SPE-HPLC method for the selective enrichment of nine phenolic compounds, which are included in the priority pollutants list of the US EPA. Also alumina prefiltering considerably reduced the amount of interfering peaks due to humic substances that could accumulated due to the preconcentration step and prevent quantification of polar phenolic compounds in environmental water samples. This method was used to determine the phenolic compounds in tap and river water and superiority to the US EPA 625 method in its enrichment factor, pretreatment time, recoveries, and detection limit. The limits of detection were in the range of $0.3-0.9\;{\mu}g/L$ in tap water sample.

적미병 보리의 유독성분에 관한 연구 (제 III 보) 유독성분과 Choline 과의 관련성에 관하여 (Studies on the Toxic Substances in Korean Barley Infected with Gibberella Zeae(III) Relation of Choline and the Toxic Substnace in the Infected Grain)

  • 김태봉;한보섭
    • 대한화학회지
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    • 제8권2호
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    • pp.82-84
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    • 1964
  • It has been pointed out that various substances such as "toxoalbumin", glycoside, choline or readily hydrolysable choline derivatives, alkaloid, lysolecithine etc. are associated with the toxicity of the infected grain. But animal tests and analysis of paper chromatography by author's indicated that a basic substance present in the concentrated extracts from the grain may neither be acetylcholine, betaine, nor choline. This problem still have to be examine further.

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유독물질 상위 및 하위규정수량의 기준 및 위험 범주 선정 방안 (Determination Method of the Criteria and the Hazard Category for Upper and Lower Tier Qualifying Quantities of the Toxic Substance)

  • 김효동;박교식
    • 한국안전학회지
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    • 제37권6호
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    • pp.9-17
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    • 2022
  • Qualifying quantities (upper tier (UT) and lower tier (LT)) are designated for the regulation of toxic substances. In this study, we aimed to establish systematic criteria for the qualifying quantities by comparing the South of Korea chemical control act with the European Seveso III Directive (Seveso III). In Seveso III, qualifying quantities are defined as "hazard categories" applying GHS (Globally Harmonized System of Classification and Labelling of Chemicals), and LTR (lower-tier requirements) and UTR (upper-tier requirements) are determined. The Pro HC (proposed hazard categories) were relevant to the GHS classification of toxic substances and were compared with the currently regulated qualifying quantities. Furthermore, we estimated the Pro LTR (proposed lower-tier requirements) and Pro UTR (proposed upper-tier requirements) corresponding to each Pro HC. Consequently, it was supposed that LT and UT were selected based on GHS like those of Seveso III. Therefore, designation criteria for qualifying quantities should be established by setting the Pro HC such as in Seveso III, rather than designating the qualifying quantities of toxic substances by itself individually. In addition, qualifying quantities should not be delegated to GHS classifications (H302, H341, H411) that do not meet the criteria for the designation of toxic substances, and the corresponding substances should be excluded from classification as toxic substances. This study provides insights into the selection of hazard categories and criteria for qualifying quantities of toxic substances.

연구활동종사자 작업환경측정 결과 및 제도개선 방향 (Work Environment Measurement Results for Research Workers and Directions for System Improvement)

  • 황제규;변헌수
    • 한국산업보건학회지
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    • 제30권4호
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    • pp.342-352
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    • 2020
  • Objectives: The characteristics of research workers are different from those working in the manufacturing industry. Furthermore, the reagents used change according to the research due to the characteristics of the laboratory, and the amounts used vary. In addition, since the working time changes almost every day, it is difficult to adjust the time according to exposure standards. There are also difficulties in setting standards as in the manufacturing industry since laboratory environments and the types of experiments performed are all different. For these reasons, the measurement of the working environment of research workers is not realistically carried out within the legal framework, there is a concern that the accuracy of measurement results may be degraded, and there are difficulties in securing data. The exposure evaluation based on an eight-hour time-weighted average used for measuring the working environment to be studied in this study may not be appropriate, but it was judged and consequently applied as the most suitable method among the recognized test methods. Methods: The investigation of the use of chemical substances in the research laboratory, which is the subject of this study, was conducted in the order of carrying out work environment measurement, sample analysis, and result analysis. In the case of the use of chemical substances, after organizing the substances to be measured in the working environment, the research workers were asked to write down the status, frequency, and period of use. Work environment measurement and sample analysis were conducted by a recognized test method, and the results were compared with the exposure standards (TWA: time weighted average value) for chemical substances and physical factors. Results: For the substances subject to work environment measurement, the department of chemical engineering was the most exposed, followed by the department of chemistry. This can lead to exposure to a variety of chemicals in departmental laboratories that primarily deal with chemicals, including acetone, hydrogen peroxide, nitric acid, sodium hydroxide, and normal hexane. Hydrogen chloride was measured higher than the average level of domestic work environment measurements. This can suggest that researchers in research activities should also be managed within the work environment measurement system. As a result of a comparison between the professional science and technology service industry and the education service industry, which are the most similar business types to university research laboratories among the domestic work environment measurements provided by the Korea Safety and Health Agency, acetone, dichloromethane, hydrogen peroxide, sodium hydroxide, nitric acid, normal hexane, and hydrogen chloride are items that appear higher than the average level. This can also be expressed as a basis for supporting management within the work environment measurement system. Conclusions: In the case of research activity workers' work environment measurement and management, specific details can be presented as follows. When changing projects and research, work environment measurement is carried out, and work environment measurement targets and methods are determined by the measurement and analysis method determined by the Ministry of Employment and Labor. The measurement results and exposure standards apply exposure standards for chemical substances and physical factors by the Ministry of Employment and Labor. Implementation costs include safety management expenses and submission of improvement plans when exposure standards are exceeded. The results of this study were presented only for the measurement of the working environment among the minimum health management measures for research workers, but it is necessary to prepare a system to improve the level of safety and health.

Green Chemistry at the present in Korea

  • Lee, Seung-Kyu;Park, Hyeon-Soo
    • Environmental Analysis Health and Toxicology
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    • 제30권sup호
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    • pp.1.1-1.5
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    • 2015
  • Objectives Despite the great contribution made by chemical substances to the development of modern civilization, their indiscriminate use has caused various kinds of damage to the global environment and human beings. Accordingly, the major developed countries and international society have tried to ensure the safe use of chemicals and a reduction in the use of hazardous chemicals through the establishment of the United Nations Environment Programme and various international agreements. In this reason, we tried to introduce about Green Chemistry progress at the present in worldwide and Korea. Methods We checked and analyzed relative journals, reports using keyword as like Green Chemistry, alternative chemicals, eco-friendly etc. and major country's government homepage search. Results Green Chemistry theory, which argues for the reduction or removal of harmfulness in chemicals throughout their entire life-cycle, has been spreading, and major developed countries, such as the US and Denmark, have developed and operate programs to provide reliable chemical information to help replace hazardous chemicals. Korea has also been conducting studies as like eco-innovation project. Through this project the "Alternative Chemical Search program," has been developed, distributed, and operated since 2011 to provide reliable information to small and medium-sized businesses that have difficulties collecting information to ensure conformity to international regulations. The program provides information that includes the regulations of major countries and Korea, information on 340 alternative chemicals, 70 application cases, and 1:1 consulting. Conclusions The Alternative Chemical Search program is expected to contribute to the establishment of response systems for regulation of Korean small and medium-sized businesses, and it also will be used to provide basic data for Korean hazardous chemical regulation, together with the Act on the Registration and Evaluation, etc. of Chemical Substances and the Chemical Control act, making it possible to establish an infrastructure for Green Chemistry in Korea and to increase national competitiveness.

화학물질의 독성에 근거한 분류체계 및 GHS 도입을 위한 대응방안 (Chemical Classification Based on Environmental and Health Toxicity and Implementation for GHS)

  • 임영욱;양지연;이용진;신동천
    • Environmental Analysis Health and Toxicology
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    • 제21권2호
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    • pp.197-208
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    • 2006
  • The hazards of chemicals can be classified using classification criteria that are based on physical, chemical and ecotoxicological endpoints. These criteria may be developed be iteratively, based on scientific or regulatory processes. A number of national and international schemes have been developed over the past 50 years, and some, such as the UN Dangerous Goods system or the EC system for hazardous substances, are in widespread use. However, the unnecessarily complicated multiplicity of existing hazard classifications created much unnecessary confusion at the user level, and a recommendation was made at the 1992 Rio Earth summit to develop a globally harmonized chemical hazard classification and compatible labelling system, including material safety data sheets and easily understandable symbols, that could be used for manufacture, transport, use and disposal of chemical substances. This became the globally harmonized system for the Classification and Labelling of Chemicals (GHS). The developmental phase of the GHS is largely complete. Consistent criteria for categorizing chemicals according to their toxic, physical, chemical and ecological hazards are now available. Consistent hazard communication tools such as labelling and material safety data sheets are also close to finalizations. The next phase is implementation of the GHS. The Intergovernmental Forum for Chemical Safety recommends that all countries implement the GHS as soon as possible with a view to have the system fully operational by 2008. When the GHS is in place, the world will finally have one system for classification of chemical hazards.

HAZOP 및 BOW-TIE를 이용한 위험물질 취급공정의 위험성평가 (Hazardous Material Process Risk Evaluation Using HAZOP and Bow-tie)

  • 남민서;유병태
    • 한국가스학회지
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    • 제28권1호
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    • pp.35-43
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    • 2024
  • 산업 및 과학기술의 고도화로 인해 신규 화학물질 수와 사용량은 꾸준히 증가하고 있으며 이에 따른 화학물질 안전관리의 중요성이 사회적으로 부각됨에 따라 국민적 요구가 높아지고 있다. 정부적인 차원에서 화학물질의 안전관리에 대해 부처별로 역할을 구분하여 관리하고 있으나 시설 노후화 및 취급 부주의 등의 문제로 매년 화학물질로 인한 사고가 빈번하게 발생되고 있는 실정이다. 국내에서 발생한 화학물질 관련 사고사례를 바탕으로 사고 유형을 분석한 결과, 누출·폭발·화재·기타 등의 순으로 사고가 발생하고 있으며 사고의 원인은 시설결함, 안전관리 미준수로 순으로 분석되었다. 본 연구에서는 화학물질 중 불산을 취급하고 있는 사업장을 대상으로 HAZOP을 통해 취급공정에 대한 유해위험요인을 파악하여 Bow-Tie를 활용한 위험성평가를 수행하였다. 본 연구 결과를 바탕으로 동종·유사 사업장의 화학사고 예방을 위한 안전관리 계획을 개선할 수 있을 것이며 이를 통해 화학사고를 사전에 예방할 수 있는 화학안전관리 체계의 선진화에 기여할 수 있을 것으로 기대된다.

PSM 제출대상 독성물질의 규정량 합리화에 대한 연구 (A Study on Reforming Threshold Quantities of Toxic Substances in Process Safety Management)

  • 이주엽;이근원;김태옥
    • 한국가스학회지
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    • 제21권4호
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    • pp.6-15
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    • 2017
  • 화학사고의 발생을 감소시키고, 예방하기 위한 공정안전관리(PSM) 제도는 우리나라의 경우 1996년부터 시행되었다. 그러나 PSM 제출대상인 기존 21종 물질에 대한 규정량과 새로이 추가된 브롬화수소 등의 독성물질의 규정량에 대한 타당성 검토가 미흡하여 많은 문제점이 발생되고 있다. 본 연구에서는 25종의 PSM 제출대상독성물질의 규정량을 국내 외 공정안전관리제도와 관련된 규정량과 비교 검토하였다. 그리고 흡입독성, NFPA 지수 등으로 구성된 독성 유해 위험성 식을 제안하여 고위험, 중위험, 저위험의 3등급으로 독성물질을 분류하고, 규정량의 조정에 반영하였다. 본 연구결과의 규정량 개선안은 유사 공정안전관리제도의 규정량 차이로 인한 사업장의 혼란과 부담 완화 및 합리적 개선에 도움을 줄 것으로 기대된다.

잔류성.생물축적성 물질 피해저감을 위한 미세플라스틱(Microplastic) 관리방안 (Microplastic Management for Preventing Risk of Persistent/Bioaccumulative Substance)

  • 박정규;간순영
    • 환경정책연구
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    • 제13권2호
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    • pp.65-98
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    • 2014
  • 해양환경의 플라스틱은 풍화작용에 의해 매우 작은 크기로 부서지는데, 이를 미세플라스틱이라고 한다. 해수에 오염된 잔류성이 크거나 생물축적성이 있는 유기물질은 미세플라스틱에 잘 흡착되며, 이들 물질이 흡착된 미세플라스틱을 해양생물이 섭취하면 먹이사슬을 통해 점차 생물축적된다. 이는 결국 해양생태계의 건강성을 파괴하고 사람을 포함한 상위포식자에게 피해를 끼친다. 해양 오염물질의 흡착제로서의 역할뿐 아니라, 미세플라스틱 그 자체에서 내분비계 교란물질이 용출되어 해양생물에 피해를 입히기도 한다. 우리나라는 잔류성이나 생물축적성이 큰 물질에 대해서는 화학물질 측면에서 규제하고 있으나, 이는 육상에서의 관리에 국한되어 있다. 만약 이들 물질이 해양생태계로 유입되면, 결국 미세플라스틱 흡착 여부에 의해 그 피해가 증가하게 된다. 이에 해양생태계 내에서의 잔류성 생물축적성 물질의 피해를 저감하기 위해서는 우선 미세플라스틱의 관리가 엄격해야 할 것이다. 이에 미세플라스틱 자체를 유해물질로 지정하여 엄격히 관리하거나, 생분해성 플라스틱 이용 확대, 재활용 및 재사용 촉구, clean-up 프로그램의 확대 등을 통해 해양생태계 내로의 플라스틱 유입을 저감하는 노력이 요구된다.

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