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The Rayleigh equation applies to an open system from which material is removed continuously under condition of a constant fractionation factor. However, such processes can proceed under different boundary conditions, even when the fractionation factors are the same. One such system is the so-called "closed" system (or 2-phase equilibrium model), where the material removed from one reservoir accumulates in a second reservoir in such a manner that isotopic equilibrium is maintained throughout the process (Gat and Gonfiantini, 1981) Waste Water Treatment and Reuse in the Mediterranean Region (The Handbook of Environmental Chemistry) Waste Water Treatment and Reuse in the Mediterranean Region (The Handbook of Environmental Chemistry) pdf, azw (kindle), epub, doc, mobi
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. C., 1994, Comparison of geochemical indices used for the interpretation of palaeoredox conditions in ancient mudstones: Chemical Geology, v. 111, p. 111–129 download Atlas of the Textural Patterns of Ore Minerals and Metallogenic Processes pdf. A much-studied example is aggregates of gold atoms, and the Nobel Prize for Chemistry for 1925 was given to Richard Zsigmondy from Göttingen for demonstrating the heterogeneous nature of such gold sols Direct Current Geoelectric Sounding (Methods in Geochemistry and Geophysics) Direct Current Geoelectric Sounding (Methods in Geochemistry and Geophysics) here
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