Sodium-potassium interdiffusion in potassium-rich alkali feldspar II: Composition- and temperature-dependence obtained from cation exchange experiments
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چکیده
منابع مشابه
Fluorescence spectroscopic studies of (acetamide + sodium/potassium thiocyanates) molten mixtures: composition and temperature dependence.
Steady state and time-resolved fluorescence spectroscopic techniques have been used to explore the Stokes' shift dynamics and rotational relaxation of a dipolar solute probe in molten mixtures of acetamide (CH(3)CONH(2)) with sodium and potassium thiocyanates (Na /KSCN) at T approximately 318 K and several other higher temperatures. The dipolar solute probe employed for this study is coumarin 1...
متن کاملDependence of potassium ion and sodium ion exchange on light in the crayfish retina.
The exchange (release resp. uptake) of K+, Rb+, and Na+ ions in the isolated retina of the crayfish Astacus leptodactylus with the surrounding medium was measured using flame photometry and radioisotopic techniques. 1. The net release of K+ into a Na+ and K+ free, choline containing medium, as measured by means of flame photometry, is increased by illumination. 2. The release of 86Rb+, used as ...
متن کاملLattice strain across Na–K interdiffusion fronts in alkali feldspar: an electron back-scatter diffraction study
Cation exchange experiments between gem quality sanidine [Formula: see text] and KCl melt produced chemical alteration of alkali feldspar starting at the grain surface and propagating inwards by highly anisotropic Na-K interdiffusion on the alkali sublattice. Diffusion fronts developing in b-direction are very sharp, while diffusion fronts within the a-c-plane are comparatively broad. Due to th...
متن کامل[Potassium transport in Escherichia coli B. II. Dependence of the intracellular steady-state potassium concentration upon the extracellular potassium and sodium concentrations in E. coli B 525].
The stationary intracellular potassium concentration in E. coli B 525 has been studied as a function of the extracellular potassium and sodium concentrations. The ratio of extracellular to intracellular potassium concentration is shown to be a linear function of the extracellular potassium concentration if the extracellular sodium concentration is low (20 mmoles/1). In the case of high sodium c...
متن کاملThe Temperature Dependence of the Isotope Effect for Electromigration of Potassium Ions in Molten Potassium Nitrate
generally interpreted as an indication of "complex ions" (which is another way of saying that a simple model with only three ionic species is inadequate) . The small absolute value of r12 in the A g N 0 3 — K N 0 3 mixture makes the experimental uncertainty more important. Thus the positive value at 380 °C indicates that also the value at 340 °C should be (small and) positive (since increased t...
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ژورنال
عنوان ژورنال: American Journal of Science
سال: 2014
ISSN: 0002-9599
DOI: 10.2475/09.2014.03