Fate and Potential Environmental Effects of Methylenediphenyl Diisocyanate and Toluene Diisocyanate Released into the Atmosphere
| Autor: | Bernard Tury, Denis Pemberton, Robert E. Bailey |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Ozone
Air pollution Management Monitoring Policy and Law medicine.disease_cause Gas phase chemistry.chemical_compound medicine Humans Waste Management and Disposal Aerosols Air Pollutants Toluene diisocyanate Waste management Atmosphere Chemistry Water Atmospheric dispersion modeling Atmospheric chemistry Environmental chemistry Toluene 2 4-Diisocyanate Oxidation-Reduction Volatility (chemistry) Degradation reaction Environmental Monitoring Forecasting Isocyanates |
| Zdroj: | Journal of the Air & Waste Management Association. 53:61-66 |
| ISSN: | 2162-2906 1096-2247 |
| DOI: | 10.1080/10473289.2003.10466120 |
| Popis: | Information from a variety of sources has been collected and summarized to facilitate an overview of the atmospheric fate and potential environmental effects of emissions of methylenediphenyl diisocyanate (MDI) or toluene diisocyanate (TDI) to the atmosphere. Atmospheric emissions of both MDI and TDI are low, both in terms of concentration and mass, because of their low volatility and the need for careful control over all aspects of their lifecycle from manufacture through disposal. Typical emission losses for TDI are 25 g/t of TDI used in slabstock foam production. MDI emission losses are lower, often less than 1 g/t of MDI used. Dispersion modeling predicts that concentrations at the fenceline or beyond are very low for typical releases. Laboratory studies show that TDI (and by analogy MDI) does not react with water in the gas phase at a significant rate. The primary degradation reaction of these aromatic diisocyanates in the atmosphere is expected to be oxidation by OH radicals with an estimated half-life of one day. Laboratory studies also show that this reaction is not expected to result in increased ground-level ozone accumulation. |
| Databáze: | OpenAIRE |
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