Bromek metylu a zubozenie warstwy ozonowej
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Home > Mathematics and Science Textbooks > Chemistry > Organic chemistry > Bromek metylu a zubożenie warstwy ozonowej
Bromek metylu a zubożenie warstwy ozonowej

Bromek metylu a zubożenie warstwy ozonowej


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Bromek metylu o przybliżonym stężeniu w troposferze wynoszącym 8 pptv i okresie życia w atmosferze wynoszącym okolo 0,8 roku (Montzka et al., 2011). Uważa się, że brom z CH3Br powoduje zubożenie warstwy ozonowej od 40 do 100 razy bardziej niż chlor. Bromek metylu jest największym źródlem bromu w stratosferze. Stanowi okolo 50% rodników bromu i uważa się, że jest odpowiedzialny za 15% zubożenia warstwy ozonowej spowodowanego przez rodniki halogenowe. Kolejne 13% jest spowodowane przez CH3Cl, a prawie 50% przez CFC. Stężenie CFC zaczęlo spadac w polowie lat 90. i dziura ozonowa nad Antarktyką zaczęla się zamykac. Jednak obecnie przewidywane zmiany klimatu mogą prowadzic do zwiększonej emisji halogenków metylu, a tym samym do wzrostu ich znaczenia dla zubożenia warstwy ozonowej. Globalne ocieplenie i dalsza niekontrolowana eutrofizacja oceanów mogą spowodowac nieznany wzrost emisji lotnych związków organicznych zawierających halogeny do środowiska globalnego. Dążąc do znalezienia alternatyw dla CH3Br, konieczne jest również ograniczenie naturalnego uwalniania CH3Br, np. poprzez mikrobiologiczne utlenianie bromku oraz metody chemiczne (30% NH4OH) w polączeniu z VIF (praktycznie nieprzepuszczalną folią) (Xuan et al., 2011).


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Product Details
  • ISBN-13: 9786202419635
  • Publisher: Wydawnictwo Nasza Wiedza
  • Publisher Imprint: Wydawnictwo Nasza Wiedza
  • Height: 229 mm
  • No of Pages: 56
  • Returnable: N
  • Weight: 141 gr
  • ISBN-10: 6202419636
  • Publisher Date: 15 Aug 2025
  • Binding: Paperback
  • Language: Polish
  • Returnable: N
  • Spine Width: 3 mm
  • Width: 152 mm


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