Quantification of Exchangeable Cations in Interlayer of Tsukinuno Sodium-Montmorillonite

2009 ◽  
Vol 1193 ◽  
Author(s):  
Haruo Sato
Keyword(s):  
Ion Exchange ◽  
Cation Exchange ◽  
Exchange Reaction ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
Exchangeable Cations ◽  
Initial Material ◽  
Ion Exchange Reaction ◽  
Reaction Constant ◽  
Good Agreement

AbstractIn this study, the cation exchange capacity (CEC) and leached exchangeable cations (LC) of montmorillonite purified from bentonite produced in the Tsukinuno bentonite mine, Yamagata, Japan, were measured, and the exchangeable cations in the interlayer of the montmorillonite were discussed. A montmorillonite, in which the soluble minerals were completely removed, was prepared. Kunipia-F and Kunipia-P, for which both bentonites originally contain approximately 100 wt.% montmorillonite, were used as the initial material. All of the measurements were carried out in a N2 atmosphere-controlled glove-box.The CEC values of montmorillonites for both bentonites (100-110 meq/100g) were similar to data conventionally reported, and the sum of LC was also approximately in good agreement with the CEC values. The share of Na+ in the interlayer of montmorillonite calculated from the LC was about 3/4 of the sum of the LC (≍ CEC), and Mg2+ and Ca2+ occupied about 7 and 19 %, respectively. Although montmorillonite in bentonite produced in the Tsukinuno bentonite mine is known as a Na type, the sum of Ca2+ and Mg2+ occupied about 26 % of all exchangeable cations in the interlayer. Based on these data, the ion exchange reaction constant between Na+ and H+ in the interlayer of montmorillonite was calculated to be -0.07. This is nearly 2 orders of magnitude lower than data that are usually adopted.

Collaborative Study of the Cation Exchange Capacity of Peat Materials

1973 ◽  
Vol 56 (1) ◽  
pp. 154-157 ◽  
Author(s):  
Virginia A Thorpe
Keyword(s):  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Collaborative Study ◽  
Statistical Treatment ◽  
Exchange Capacity ◽  
Exchangeable Cations ◽  
Satisfactory Degree ◽  
Modified Method ◽  
Precision And Accuracy

Abstract To provide a measure of the total amount of exchangeable cations that can be held by peat expressed as mequiv./100 g air-dried peat, the modified method of Puustjärvi for cation exchange capacity has been proposed and studied collaboratively. The statistical treatment of the collaborators’ results indicate a satisfactory degree of precision and accuracy for the 3 products considered, moss, humus, and reed-sedge. The method for cation exchange capacity of peat materials, with the description of the transfer technique included, has been adopted as official first action. The 7 ASTM methods have been adopted as procedures.

scholarly journals Influence of clay minerals and exchangeable cations on the formation of humic-like substances (melanoidins) from D-glucose and L-tyrosine

Clay Minerals ◽  
1999 ◽  
Vol 34 (3) ◽  
pp. 487-497 ◽  
Author(s):  
P. Arfaioli ◽  
O. L. Pantani ◽  
M. Bosetto ◽  
G. G. Ristori
Keyword(s):  
Cation Exchange ◽  
Clay Minerals ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
Exchangeable Cations ◽  
Reaction Conditions ◽  
Polymeric Compounds

AbstractThe ability to produce humic-like polymeric compounds, with D-glucose and L-tyrosine as starting materials, was evaluated in different mineral systems: (1) Ca-, Al- and Cu(II)-saturated montmorillonite; (2) Ca-, Al- and Cu(II)-saturated kaolinite; (3) quartz in the presence of two different amounts of the same cations (according to the cation exchange capacity of the clays); and (4) untreated quartz (as control). All systems proved to be effective in the formation of humic-like compounds, particularly quartz, in the presence of cations. The effectiveness in promoting humification reactions was strictly related to the amounts of added cations. In the reaction conditions considered, the humification appears to be due more to the cations than to the type of clay minerals. The clayey systems synthesized more complex (aromatic) substances than the quartz ones.

The Use of Some Ion-Exchange Sorbing Tracer Cations in Insitu Experiments in High Saline Groundwaters

1994 ◽  
Vol 353 ◽  
Author(s):  
J. Byegård ◽  
G. Skarnemark ◽  
M. Skålberg
Keyword(s):  
Ion Exchange ◽  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Alkali Metals ◽  
Alkaline Earth ◽  
Exchange Capacity ◽  
Alkaline Earth Metals ◽  
Crushed Granite ◽  
The Difference

AbstractThe possibility to use alkali metals and alkaline earth metals as slightly sorbing tracers in in-situ sorption experiments in high saline groundwaters has been investigated. The cation exchange characteristics of granite and some fracture minerals (chlorite and calcite) have been studied using the proposed cations as tracers. The results show low Kd’s for Na, Ca and Sr (∽0.1 ml/g), while the sorption is higher for the more electropositive cations (Rb, Cs and Ba). A higher contribution of irreversible sorption can also be observed for the latter group of cations. For calcite the sorption of all the tracers, except Ca, is lower compared to the corresponding sorption to granite and chlorite. Differences in selectivity coefficients and cation exchange capacity are obtained when using different size fractions of crushed granite. The difference is even more pronounced when comparing crushed granite to intact granite.

scholarly journals Scalable fabrication of high-quality crystalline and stable FAPbI3 thin films by combining doctor-blade coating and the cation exchange reaction

Nanoscale ◽  
2019 ◽  
Vol 11 (13) ◽  
pp. 5989-5997 ◽  
Author(s):  
Sampson Adjokatse ◽  
Hong-Hua Fang ◽  
Herman Duim ◽  
Maria Antonietta Loi
Keyword(s):  
Thin Films ◽  
Ion Exchange ◽  
Cation Exchange ◽  
Exchange Reaction ◽  
High Quality ◽  
Coating Technique ◽  
Doctor Blade ◽  
Ion Exchange Reaction ◽  
Cation Exchange Reaction ◽  
Blade Coating

This study highlights the importance of a scalable blade coating technique and the ion exchange reaction in fabricating high-quality perovskite thin films.

Acid character of nontronite: permanent and pH-dependent charge components of cation exchange capacity

Clay Minerals ◽  
1972 ◽  
Vol 9 (4) ◽  
pp. 425-433
Author(s):  
B. S. Kapoor
Keyword(s):  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
Exchangeable Cations ◽  
Dependent Component ◽  
Ph Dependent ◽  
The Difference ◽  
The Cost ◽  
Fe Ions ◽  
Acid Character

AbstractThe cation exchange capacity (C.E.C.) of nontronite was determined by titrating the acid clay, prepared by the action of H-resin on nontronite, in water and some nonaqueous solvents. The base-titratable acidities of the acid nontronite, freshly prepared as well as aged, were found to be greater than the acidities extractable with 1 N NaCl; the difference was attributed to the non-exchangeable pH-dependent component of C.E.C. In the freshly prepared sample, H+ and Fe3+ ions were the only exchangeable cations. Ageing produced basic Fe ions which were exchangeable and whose amount increased at the cost of H− and Fe3+ ions. Whatever the age, the total quantity of these exchangeable cations corresponding to the total isomorphous charge, remained constant. The amount of the pH-dependent acidity also remained unchanged. A likely mechanism to account for the observed pH-dependent component of the C.E.C, of nontronite is suggested.

Determination of the cation exchange capacity of clays with copper complexes revisited

Clay Minerals ◽  
2005 ◽  
Vol 40 (4) ◽  
pp. 441-453 ◽  
Author(s):  
L. Ammann ◽  
F. Bergaya ◽  
G. Lagaly
Keyword(s):  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Copper Complexes ◽  
Standard Procedure ◽  
Reference Method ◽  
Exchange Capacity ◽  
Equilibrium Solutions ◽  
Spectral Photometry ◽  
Good Agreement

AbstractThe determination of the cation exchange capacity (CEC) of clays by exchange with the cationic copper complexes [Cu(en)2]2+ and [Cu(trien)]2+ is revisited. The procedures reported by Bergaya & Vayer (1997) and Meier & Kahr (1999) are modified slightly. The concentration of the copper complexes in the equilibrium solutions is measured by spectral photometry. Correct CEC values of the [Cu(en)2]2+ exchange are only obtained when a buffer (‘tris’, tris (hydroxymethyl) aminomethane, pH = 8) is added to the equilibrium solution after separation of the clay, because the molar extinction coefficient of this complex depends on the pH of the solution. A standard procedure is recommended as a reference method. In most cases, tris addition is not needed for the determination with [Cu(trien)]2+ cations. Nevertheless, tris addition is recommended in the standard procedure. Determination of CEC for 40 samples (kaolins, ‘common clays’, bentonites, montmorillonites and beidellite) shows a good agreement between measurements using [Cu(en)2]2+ and [Cu(trien)]2+ cations and with results by the ammonium acetate method.

scholarly journals A comparison between three methods for the determination of cation exchange capacity and exchangeable cations in soils

Agronomie ◽  
1997 ◽  
Vol 17 (1) ◽  
pp. 9-16 ◽  
Author(s):  
H. Ciesielski ◽  
T. Sterckeman ◽  
M. Santerne ◽  
J. P. Willery
Keyword(s):  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
Exchangeable Cations
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