Partially halogenated chlorofluorocarbons (ethane derivatives / published under the joint sponsorship of the United Nations Environment Programme, the International Labour Organisation, and the World Health Organization
النسخة الإلكترونية غير متاحة
عرض الإحصاءاتعرض الإحصاءات
الملخصEvaluates the environmental behaviour, toxicity, and ozone-depleting and global-warming potentials of six partially halogenated ethane derivatives selected as candidates to replace the fifteen fully halogenated chlorofluorocarbons that are being phased out in line with the provisions of the Montreal Protocol on Substances that Deplete the Ozone Layer. The compounds considered are 1,1-dichloro-1-fluoroethane (HCFC 141b), 1-chloro1,1-difluoroethane (HCFC 142b), 1,2-dichloro-1,1-difluoroethane (HCFC 132b), 1-chloro-2,2,2-trifluoroethane (HCFC 133a), 1,1-dichloro-2,2,2-trifluoroethane (HCFC 123), and 1-chloro-1,2,2,2-tetrafluoroethane (HCFC 124). All compounds were judged to have ozone-depleting and global-warming potentials considerably lower than those of CFC 11, the fully halogenated chlorofluorocarbon with the highest ozone-depleting and global-warming potentials. Estimated atmospheric lifetimes range from 1.6 years for HCFC 123 to 19.1 years for HCFC 142b. Because studies of HCFC 132b and HCFC 133a have documented a number of toxic effects, these compounds could not be recommended as substitutes. Since the toxicity of HCFC 142b is low and the ozone-depleting and global-warming potentials are lower than those of the fully halogeated chlorofluorocarbons, the report concludes that HCFC 142b can be considered as a transient substitute for the chlorofluorocarbons included in the Montreal Protocol. In view of the paucity of toxicological data on HCFC 141b, HCFC 123, and HCFC 125, no evaluation of their potential effects on human health could be made
World Health Organization & International Programme on Chemical Safety. (1992). Partially halogenated chlorofluorocarbons (ethane derivatives / published under the joint sponsorship of the United Nations Environment Programme, the International Labour Organisation, and the World Health Organization. World Health Organization. https://apps.who.int/iris/handle/10665/39520
Environmental health criteria ; 139
English with summaries in French and Spanish
البياناتعرض سجل كامل للمادة
مواد ذات صلة
عرض المواد ذات الصلة حسب العنوان، إسم المؤلف والموضوع.
International Programme on Chemical Safety; World Health Organization (1990)Evaluates the risks to human health and the environment posed by the production and use of fully halogenated chlorofluorocarbons. Eight different commercial compounds, some of which are known to contribute to ozone depletion, are assessed. The opening section summarizes the unique chemical and physical properties that account for the commercial importance of chlorofluorocarbons and explain why their degradation in the upper stratosphere destroys ozone. Subsequent sections summarize data on the global distribution of chlorofluorocarbons and ...