biotite film concentration

Biotite, a phyllosilicate mineral, possesses significant potential for cesium (Cs) adsorption owing to its negative surface charge, specific surface area (SSA), and frayed edge sites (FES). ... Especially, the Cs selectivity in Cs-containing seawater, including high concentrations of cations and organic matter, was significantly enhanced from ...

The biotite weathering rate deduced from these data ranges from 7.8 × 10 −17 mol·m −2 ·s −1 to 6.5 × 10 −16 mol·m −2 ·s −1, which is consistent with the range of field rates previously reported. This rate was compared to the weathering rate of biotites induced by the substitution of vegetation occuring 35 years ago in a nearby ...

Amounts of 0.4 g of biotite were dispersed in 40 mL NaCl or CaCl 2 (1–100 mM) solutions. A U(VI) concentration of 2 × 10 − 4 M and a size fraction of < 3 mm of biotite were used. Although there is a possibility that U(VI) precipitates at near-neutral pH, higher U concentrations were used for the purpose of U(VI) interlayer adsorption.

Micro-flotation experiments showed that the recovery of biotite increased to above 90 % upon adding mixed SDS/DDA collectors under the concentration of 5 × 10 −4 mol/L with a molar ratio of 5:1 at alkaline pH (10–11), while that of quartz was below 10 %. The surface tension tests showed that the mixed collectors were easier to absorb on ...

Biotite is an important adsorption carrier in the constituent minerals of Beishan granite. In this work, the effects of compaction density and ionic strength on the diffusion behavior of Se(IV) and Re(VII) in biotite were studied by capillary in-diffusion method and diffusion cell through-diffusion method. When the compaction density …

We present N concentration and N isotope values for whole-rock data alongside biotite, plagioclase and K-feldspar mineral separates and assess the degree to which these data preserve equilibrium partitioning during magmatic differentiation. ... Our biotite-to-whole-rock N data also closely match published biotite-melt values (Förster et …

The solution concentration of these elements may instead be controlled by equilibrium with a complex alteration product of biotite. Secondary sheet silicates such as vermiculite, smectite and mixed-layer clays have been observed as weathering products of biotite in natural systems (Banfield and Eggleton, 1988; Fanning et al., 1989; Fordham, …

Chemical composition of magmatic biotite is sensitive to chemical and physical factors associated with crystallization of the magma (Munoz, J.L., 1992, Abdel-Rahman, A.F.M., 1994) and also to exsolved hydrothermal fluids (Siahcheshm et al., 2012).The interlayer cations (K +, Na +, Ca 2 +, Ba +, and Cs +) in biotite crystals could …

Results show that the concentration of protons consumed by biotite, during the titration series, increases with decreasing pH. The minimum proton consumption …

Introduction. The copper deposits in the world are widely distributed across five continents including more than 150 countries 1.According to the proportion of oxide minerals and sulfide minerals in copper ores, it can be divided into sulfide ores containing copper oxide less than 10%, mixed ores containing copper oxide of 10–30% and oxide …

The biotite with higher copper showing light-gray color, usually is lighter than the biotite with lower copper or copper free biotite which shows dark-gray color 32. However, the color of ...

The solid:water weight ratio was 16:100. The funnel was sealed with a polyethylene plastic film to prevent evaporation. The interacting solution was completely collected at the ... of biotite was also an important cause of sandstone deterioration in the Nankan Grotto (Fig. 9b, c), even though the concentration of biotite was very low and …

The F concentration in melt remains nearly constant at ca. 2,000–3,000 ppm at high temperatures as well as near solidus conditions, indicating that it is not largely affected by fluid exsolution because of its strongly preferred incorporation into melt. ... W Bt F and W m F are the F concentrations in biotite and melt, respectively. The melt ...

The biotite–carbonate zone assemblage of quartz–calcite–albite–biotite–chlorite–pyrrhotite suggests metasomatism by a K–S–CO 2 bearing fluid at 400 °C (Witt et al., 1997). The alteration temperature is consistent with oxygen isotope thermometry from calcite and quartz veins that shows a clustering of …

Abstract and Figures. The chemical composition and charge of the biotite near-surface, in contact with NaCl bearing aqueous solutions at 25 °C from pH 1 to 12, have been derived via zeta ...

Using samples from the alkaline magmatic series of Tenerife, we are able to demonstrate (1) clustering of previously characterized units into distinct, homogeneous groups based on V, Co, and Nb concentrations in biotite, despite the presence of extreme variation and zonation in other trace elements (Ba, Sr, Rb) that indicate complex ...

The composition of igneous biotite is a potential indicator of the geologic environment of its host rock. Here, we apply two machine learning models−eXtreemly Greedy tree Boosting (XGBoost) and light …

The mean of biotite least-radiogenic plagioclase apparent ages indicates that the biotite Rb–Sr age for CK002 must be <420 Ma, hence not part of the older c. 430 Ma biotite Rb–Sr age component. Higher apatite 87 Sr/ 86 Sr in CK001 appears to correlate with younger apatite U–Pb and biotite Rb–Sr ages than CK006, consistent with ...

Concentrations of Na+ and [Na+] are 40 times as high as the [K+] concentrations in the ocean. Similarly, river water is not high in [K+] [21]. There were K-containing minerals on the early Earth, such as K-feldspars, as well as biotite and muscovite [22]. Two main hypotheses have been published for the origins of life in high …

Biotite dissolution rates were determined at 25 °C, at pH 2–6, and as a function of mineral composition, grain size, and aqueous organic ligand concentration. Rates were measured using both open- and closed-system reactors in fluids of constant ionic strength. Element release was non-stoichiometric and followed the general trend of …

Biotite and K-feldspar fractionation in the alkaline arc series results in the moderation of K2O/Na2O values and LILE concentrations with increasing SiO2 as compared to the more common calc-alkaline series characterized by amphibole and plagioclase crystallization and strong increases in K2O/Na2O values. Lastly, we suggest …

The relatively high whole-rock U concentrations (8.0–38.6 ppm) and low whole-rock ratios of Th/U (0.5–3.2) and REE/U (2.1–13.5) of the Zhangjia and Douzhashan granites favored the crystallization of uraninite. The samples experiencing fluid-wallrock interaction from the Zhangjia granite are characterized by low whole-rock U …

The high concentration of Mg in fertile biotite is inherited from the parent magma and implies being derived from mafic magma. This fact can result from the continuous flux of mafic melt from deeper magma source to the shallow magma chamber. The behavior of copper, gold, and other chalcophile elements in the magmas is …

Intracellular potassium concentrations, [K+], are high in all types of living cells, but the origins of this K+ are unknown. The simplest hypothesis is that life emerged in an environment that was high in K+. One such environment is the spaces between the sheets of the clay mineral mica. The best mica for life's origins is the black mica, biotite, …

Only at temperatures well within those char- *Calculated Ti concentrations are somewhat lower than Ti concentrations observed in biotite present in rocks which crystallized at the same P-T conditions. This dis- crepancy arises in part from the assumption of stoichio- metric AISi3 tetrahedral site occupancy, full interlayer cation …

whether the concentration one of the components is de- pendent on the concentration of the other (e.g. C1 is de- pendent on Fe), or whether both are dependent on an external …

Abstract. Biotite dissolution rates were determined at 25 °C, at pH 2–6, and as a function of mineral composition, grain size, and aqueous organic ligand …

High temperature anatexis within the middle to lower crust is a direct consequence of the incongruent melting of hydrous minerals (muscovite, amphibole, biotite) leaving an anhydrous residue and generating significant amounts of granitoid melts (Brown 1994; White and Powell 2002).Granulites are often considered as the anhydrous …

The biotite major/minor element compositions in the raw dataset are reported as weight percent oxides of Si, Al, Ti, Cr, Fe, Mg, Mn, Zn, K, Ba, Ca, and Na, and elemental concentration of F and Cl. However, in many analyses, the concentrations of some of …

Using biotite (K(Mg,Fe)(3)AlSi(3)O(10)(OH,F)(2)) as a model clay mineral, brine-biotite interactions were studied under conditions relevant to GCS sites (95 °C, 102 atm CO(2), and 1 M NaCl solution). To ensure safe and efficient geologic CO(2) sequestration (GCS), it is crucial to have a better understanding of CO(2)-brine-rock interactions under GCS …

The SEM and TEM images of tourmaline, halloysite and biotite are shown in Fig. 1.The morphological observations reveal that the as-received tourmaline shows a massive shape with rough surface (Fig. 1 a), and with further dispersion in absolute ethanol, the shape of sample presents irregular granules, with sizes ranging from 14 to 30 nm …

where S% is the percentage of U(VI) adsorption, C 0 and C eq (mol/L) are the initial and equilibrium concentrations of U(VI); Q (mol/g) is the quantity of adsorbed U(VI) on biotite; V (mL) is the volume of the suspension and m (g) is the mass of biotite.. The standard dimensionless thermodynamic equilibrium constant, K Eq 0, was employed in …