Na- and Cs-exchange in a clinoptilolite-rich rock: Analysis of the outgoing cations in solution
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Ryean-Marie Woods
Abstract
Batch cation-exchange experiments were performed by placing 4 g of clinoptilolite-rich rock into 100 mL of 1 M concentrations of NaCl or CsCl solution for differing times and temperatures. The solutions were analyzed for the outgoing cations Na, K, Ca, and Mg by ICP-AES. The goal of these experiments was to determine the behavior (i.e., effect of temperature, release rate, and time) of Na, K, Ca, and Mg exchanging out of the solid and into the liquid in either NaCl or CsCl solutions. For the Na-exchanged samples, the concentration of the outgoing divalent cations increased with time and increased temperature, with the majority of the exchange occurring in the first 10 h. Potassium behaved in a different manner, with approximately 20% exchange occurring within 0.5 h. With increased exchange time, K concentrations actually decreased slightly, indicating some reexchange back into the solid from the liquid. After 24 h, samples in the four storage conditions averaged approximately 20% K, 80% Ca, and 50% Mg exchange out of the sample and into the liquid. For the Cs-exchanged samples, the concentration of the outgoing divalent cations increased with time and increased temperature, with the majority of the exchange occurring in the first 10 h. The outgoing monovalent cations behaved in a different, and somewhat unpredictable, manner. The majority of the exchange for both Na and K occurred within the first 0.5 h. Increased time had little effect on exchange; in fact, both exhibited some re-exchange back into the liquid. Also, more exchange occurred at lower than higher temperatures. With increased exchange time, K concentrations decreased slightly, indicating some re-exchange back into the solid from the liquid. After 24 h, samples in the four storage conditions averaged approximately 85% Na, 50% K, 80% Ca, and 40% Mg exchange out of the sample and into the liquid.
© 2015 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
- Some mineral physics constraints on the rheology and geothermal structure of Earth’s lower mantle
- Biodurability of talc
- Microbial biomineralization in weathered volcanic ash deposit and formation of biogenic minerals by experimental incubation
- In situ atomic force microscopy study of hectorite and nontronite dissolution: Implications for phyllosilicate edge surface structures and dissolution mechanisms
- Na- and Cs-exchange in a clinoptilolite-rich rock: Analysis of the outgoing cations in solution
- The effects of time, temperature, and concentration on Sr2+ exchange in clinoptilolite in aqueous solutions
- Thermodynamics of ion-exchanged and natural clinoptilolite
- Thermochemical study of calcium zeolites–heulandite and stilbite
- Fe3+/ΣFe vs. FeLα peak energy for minerals and glasses: Recent advances with the electron microprobe
- Fibrous nanoinclusions in massive rose quartz: The origin of rose coloration
- Cathodoluminescence study of apatite crystals
- Hydrogen in spessartine-almandine garnets as a tracer of granitic pegmatite evolution
- Ab initio studies of possible fluorine-bearing four- and fivefold coordinated Al species in aluminosilicate glasses
- The nature of radiohaloes in biotite: Experimental studies and modeling
- Boron metasomatism of the Alta stock contact aureole, Utah: Evidence from borates, mineral chemistry, and geochemistry
- Low P-T Caledonian resetting of U-rich Paleoproterozoic zircons, central Sweden
- Graphical analysis of the orthopyroxene-pigeonite-augite-plagioclase equilibrium at liquidus temperatures and low pressure
- Synthesis and characterization of white micas in the join muscovite–aluminoceladonite
- Displacive components of the low-temperature phase transitions in lawsonite
- Radiographic study on the viscosity of the Fe-FeS melts at the pressure of 5 to 7 GPa
