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  • 1
    ISSN: 1572-879X
    Keywords: metal-oxygen cluster compounds ; heteropoly acids ; stability ; pH ; aqueous solutions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The stabilities of the solid superacids H3Mo12O40, H3PW12O40, H4SiMo12O40 and H4SiW12O40 in aqueous solution have been measured at various values of pH by use of ion chromatographic analyses. The aforementioned acids are completely decomposed at values of pH, 4.0, 5.2, 7.0 and 11.0, respectively. The stabilities in aqueous solution with respect to pH follow the order H4SiW12O40 〉 H3PW12O40 〉 H4SiMo12O40 〉 H3PMo12O40.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Plant and soil 52 (1979), S. 127-130 
    ISSN: 1573-5036
    Keywords: Ecotypes ; Lead tolerance ; Moorland
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The mean frequency of plants along a transect descending Wanlock Dod, near Leadhills, Lanarkshire, Scotland was determined by quadrat analysis. The results obtained strongly suggested that lead tolerant ecotypes ofAgrostis tenuis, Nardus stricta andPotentilla erecta were present above known lead veins. The evidence forVaccinium myrtillus was less certain. Other species appeared to be affected by soil moisture content, grazing pressure and climatic factors. The areas above known lead veins exhibited a larger diversity of species than the areas between veins.
    Type of Medium: Electronic Resource
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