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  • 1
    Electronic Resource
    Electronic Resource
    Interactions between citrate and montmorillonite-A1 hydroxide polymer systems (1997)
    Oxford, UK : Blackwell Publishing Ltd
    European journal of soil science 48 (1997), S. 0 
    Details
    ISSN: 1365-2389
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Citrate forms strong complexes with A1 ions and may thus influence the stability and formation of Clay-A1 hydroxide polymer systems (CAIHO). We studied the adsorption of citrate to CAIHO and the influence of citrate on the stability and formation of CAIHO at different A1:clay and A1:citrate ratios and pH values and at a total salt concentration of 0·01 M monovalent anions. The amount of citrate sorbed to the aged CAIHO was independent of the A1 fixed to the clay as A1 hydroxide polymers (AIHO) at 5 〈 pH 〈 6·6. The added citrate seemed not to sorb to the AIHO but only to the edges of the clay. As the citrate: Al ratio increased from 15–1:l at pH 6, more of the AIHO of the aged CAMO systems dissolved. The change in the CEC of the clay indicated that the nature of the remaining AIHO is independent of the amount of A1 dissolved. Citrate influenced the formation of CAIHO systems as measured at pH 6·6, to an extent which depended on the citrate: Al ratio. At a small ratio (1:5), AIHO formed and all citrate was incorporated in the AIHO, probably leading to a coprecipitate. The amount of citrate incorporated depended linearly on the amount of AIHO present. Co-precipitation of AIHO and citrate probably led to the formation of a separate phase, which was only weakly bound to the clay particles. At a large citrate: Al ratio (1:1) soluble Al-citrate complexes became dominant, and only a small part of the added A1 was present as AIHO.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2389.1997.tb00212.x
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  • 2
    Electronic Resource
    Electronic Resource
    EVALUATION MODELS FOR ENVIRONMENTAL ASPECTS OF ENERGY CONVERSION SYSTEMS (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Papers in regional science 60 (1986), S. 0 
    Details
    ISSN: 1435-5957
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography , Economics
    Notes: Environmental aspects of energy conversion, in particular the generation of electricity, play an important role in the decision process on energy projects. A decision support model is proposed which distinguished three evaluation levels of environmental aspects: the emission level, the concentration level and the effect level. Multi-criteria analysis (a combination of the “expected value method” and the “weighted summation”) and graphical presentation methods are used in evaluate the model which is implemented for seven electricity producing energy conversion systems, ranging from nuclear and coal, to oil, gas and wind. These systems are evaluated on the following to environmental criteria: acidification, photo-chemical pollution, climatic effects, noise, thermal pollution, solid and nuclear waste, land use requirement, risk and visual disturbance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1435-5597.1986.tb01018.x
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