scholarly journals Dependence of displacement of Ca, Md, Fe, K ions from soils from the duration of exposure to H2O and temperature

2021 ◽  
Vol 4 (46) ◽  
pp. 5-5
Author(s):  
Alexander Saakian ◽  
◽  
Keyword(s):  
Complex Formation ◽  
Ion Exchange ◽  
Soil Temperature ◽  
Temperature Influence ◽  
Exchange Reactions ◽  
Podzolic Soils ◽  
Physico Chemical ◽  
Mobility Of Ions ◽  
Ion Desorption ◽  
Kinetics Of

In the conducted studies on sod-podzolic soils and ordinary chernozems, a change in the rate of transition of Ca, Md, Fe, K ions from the soil to H2O at temperatures of 0 and 20º, the interaction time of 1 day and 1 week was established. It is shown that the speed of the processes depends on the combination of temperature and duration of reactions, differs for individual soils, horizons and certain cations. The magnitude of the change in the rate of the processes under consideration does not fully correlate with the physico-chemical and thermodynamic patterns of changes in the mobility of ions in soils depending on humidity and temperature, which is associated with the simultaneous course of ion exchange reactions, complex formation, sedimentation. The necessity of studying the kinetics of processes occurring in the soil for a more correct assessment of the agroecological state of soils is proved. Keywords: KINETICS, SOIL, TEMPERATURE INFLUENCE, ION DESORPTION

Kinetics of Ion-Exchange Reactions in Hybrid Organic–Inorganic Perovskite Thin Films Studied by In Situ Real-Time X-ray Scattering

2018 ◽  
Vol 9 (23) ◽  
pp. 6750-6754 ◽  
Author(s):  
Alessandro Greco ◽  
Alexander Hinderhofer ◽  
M. Ibrahim Dar ◽  
Neha Arora ◽  
Jan Hagenlocher ◽  
...  
Keyword(s):  
Thin Films ◽  
Ion Exchange ◽  
Real Time ◽  
Exchange Reactions ◽  
Inorganic Perovskite ◽  
X Ray ◽  
X Ray Scattering ◽  
Kinetics Of ◽  
Kinetics Of Ion Exchange

Investigation into the kinetics of ion-exchange processes accompanied by complex formation

1981 ◽  
Vol 43 (4) ◽  
pp. 787-789 ◽  
Author(s):  
A.I. Kalinichev ◽  
T.D. Semenovskaya ◽  
E.V. Kolotinskaya ◽  
A.Ya. Pronin ◽  
K.V. Chmutov
Keyword(s):  
Complex Formation ◽  
Ion Exchange ◽  
Exchange Processes ◽  
Kinetics Of ◽  
Kinetics Of Ion Exchange

scholarly journals Ion-exchange properties of Zn4(OH)6(SO4) 2.5H2O

2020 ◽  
Vol 81 (3) ◽  
pp. 28-30
Author(s):  
Zlatka Delcheva ◽  
Tsveta Stanimirova ◽  
Nadia Petrova
Keyword(s):  
Ion Exchange ◽  
Room Temperature ◽  
Water Solution ◽  
Exchange Reactions ◽  
Hydrate Phase ◽  
Sulfate Hydrate ◽  
Kinetics Of ◽  
New Phase ◽  
Exchange Properties ◽  
Kinetics Of Ion Exchange

The aim of the present study is to check the possibilities for ion exchange of a new zinc-hydroxy-sulfate-hydrate phase, Zn4(OH)6SO4·2–2.25H2O. The new zinc hydroxy sulfate hydrate phase was obtained by mixing of 0.5 g of Zn5(OH)8(NO3)2.2H2O and 50 ml of 1M Na2SO4 for 48h at room temperature and pH of the solution between 5–7. Ion-exchange properties were investigated by mixing of 0.2 g Zn4(OH)6(SO4) 2.5H2O with 20 ml water solution of NaCl, CaCl2 or SrCl2 with different concentrations (0.5М, 1М, or 2M) for different time (24h, 48h and 72h) at room temperature. The pH of the solutions varied in the range 6–8. The new phase has exchange properties potentials, like other zinc hydroxy sulfate hydrates composed of octahedral-tetrahedral layers. The results obtained for the kinetics of ion-exchange reactions are additional useful data for the solving of the structure of the new zinc-hydroxy-sulfate-hydrate phase in the future.

Solvent Effects on Solvent Exchange Reactions at Nickel(II) Centers

1975 ◽  
Vol 53 (5) ◽  
pp. 702-709 ◽  
Author(s):  
Cooper H. Langford ◽  
James P. K. Tong ◽  
André Merbach
Keyword(s):  
Complex Formation ◽  
Linear Relationship ◽  
Solvent Effects ◽  
Solvent Exchange ◽  
Exchange Reactions ◽  
Solvent Dependence ◽  
Leaving Group ◽  
Exchange Kinetics ◽  
Kinetics Of ◽  
Solvent Properties

Several recent correlations relating kinetics of Ni(II) complex formation and solvent exchange to solvent properties are examined after collection of literature and new experiments on solvent exchange kinetics at Ni(II) when onlythesolvent is varied (entering group, leaving group, and nonlabile ligands held constant). The results indicate solvent exchange is remarkably insensitive to bulk solvent. It is suggested that this implies that the interesting correlations of complex formation rates with solvents introduced by Bennetto and Caldin provide a means to study the solvent dependence of the encounter equilibria between a Ni(II) complex and a ligand L. The linear relationship between enthalpies and entropies of activation for reactions at Ni(II) in different media is attributed to the changes in the ligands bound to the Ni(II) center but not undergoing substitution in the reaction observed.

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