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  • Environmental impact assessment  (1)
  • Kinetic isotope effects  (1)
  • 1
    Publikationsdatum: 2021-05-19
    Beschreibung: This paper investigates the question of what influence human beings have had on biodiversity in the region of KwaZulu-Natal in South Africa. A historical analysis has been made of human impact on local ecosystems and species accompanied by statistics on the reduction of habitats and systems caused by urbanisation, cultivation, silviculture and state dams. The major causes of biodiversity loss are identified as being habitat destruction or modification and extractive utilisation. The most important problem is that the government of South Africa does not have an effective environmental management system to ensure wise decision-making. The result has been sectoral ministries empowered with the dual role of both exploiting and preserving natural resources. In 1989 guidelines for Integrated Environmental Management were produced by the Department of Environmental Affairs with an environmental impact assessment procedure. However, the procedure is weak because cumulative and synergistic impacts of development are poorly considered, because the land-use planning framework at the regional and even subregional scale is incomplete, and because there is generally poor understanding of how various land-uses impact on biodiversity. What is more, the procedure hasn't been given force of law due to the worry that the country cannot afford expensive assessment procedures when economic growth is the priority.
    Beschreibung: Published
    Schlagwort(e): Ecological balance ; Environmental impact assessment ; Biodiversity
    Repository-Name: AquaDocs
    Materialart: Report , Non-Refereed
    Format: 73293 bytes
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    ISSN: 1572-9028
    Schlagwort(e): Kinetic isotope effects ; heterogeneous catalysis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Microreactor and kinetic isotope techniques have been used to study the mechanism and kinetics of the surface dehydrochlorination of 1,2-dichloroethane over alkali metal chloride modified copper(II) chloride onγ-Al2O3 catalysts. A first order rate law is obeyed and the rate constant decreases progressively on addition of LiCl, NaCl, KCI or RbCI to the copper catalyst but increases again on addition of CsCl; the changes arise mainly from changes in the activation energy. A primary kinetic isotope ratiok H/k D = 1.87 at 285°C is observed for perdeutero 1,2-dichloroethane on the unmodified catalyst indicating the C-H bond breaking occurs in the rate determining step. Changes ink H/k D on addition of the alkali chlorides parallel those ofk H. The rate determining step changes smoothly from one involving C-H bond breakage to one involving C-Cl bond breakage as the catalyst is modified with alkalichlorides.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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