Determination of the apparent ion exchange capacity

1979 ◽  
Vol 51 (2) ◽  
pp. 285-290 ◽  
Author(s):  
C. Konečný
Keyword(s):  
Ion Exchange ◽  
Exchange Capacity ◽  
Ion Exchange Capacity

Equilibrium Sorptions in Heterogeneous Ion Exchange Membranes

1992 ◽  
Vol 57 (9) ◽  
pp. 1905-1914
Author(s):  
Miroslav Bleha ◽  
Věra Šumberová
Keyword(s):  
Experimental Data ◽  
Ion Exchange ◽  
Total Content ◽  
Distribution Coefficients ◽  
Exchange Capacity ◽  
Ion Exchange Membranes ◽  
Ion Exchange Capacity ◽  
Equilibrium Sorption ◽  
Inhomogeneity Factor

The equilibrium sorption of uni-univalent electrolytes (NaCl, KCl) in heterogeneous cation exchange membranes with various contents of the ion exchange component and in ion exchange membranes Ralex was investigated. Using experimental data which express the concentration dependence of equilibrium sorption, validity of the Donnan relation for the systems under investigation was tested and values of the Glueckauf inhomogeneity factor for Ralex membranes were determined. Determination of the equilibrium sorption allows the effect of the total content of internal water and of the ion-exchange capacity on the distribution coefficients of the electrolyte to be determined.

Determination of the ion-exchange capacity of anion-selective membranes

2014 ◽  
Vol 39 (10) ◽  
pp. 5054-5062 ◽  
Author(s):  
F. Karas ◽  
J. Hnát ◽  
M. Paidar ◽  
J. Schauer ◽  
K. Bouzek
Keyword(s):  
Ion Exchange ◽  
Exchange Capacity ◽  
Ion Exchange Capacity ◽  
Selective Membranes

DETERMINATION OF CHROMIUM(VI) IN WATER BY PIXE ANALYSIS USING ION EXCHANGE PAPER — LIMIT OF DETECTION AND INTERFERENCE BY COEXISTING ANIONS

2009 ◽  
Vol 19 (01n02) ◽  
pp. 1-8 ◽  
Author(s):  
SUREERAT THOMYASIRIGUL ◽  
HITOSHI FUKUDA ◽  
JUN HASEGAWA ◽  
YOSHIYUKI OGURI
Keyword(s):  
Ion Exchange ◽  
Proton Energy ◽  
Limit Of Detection ◽  
Deae Cellulose ◽  
Exchange Capacity ◽  
Ion Exchange Capacity ◽  
Pixe Analysis ◽  
X Ray ◽  
Chromium Vi

Concerning the PIXE analysis of Cr ( VI ) in water using ion-exchange filters, the limit of detection (LOD) and the influence of matrix anions were investigated. In order to look for the experimental condition for obtaining the minimum LOD, we measured the Cr - K α X-ray counts and background counts under the K α X-ray peak as a function of the incident proton energy and the thickness of the Mylar absorber foil in front of the detector. To investigate the interference by coexisting anions, each of PO 43-, SO 42-, NO 3-, Cl -, and F - ions and Cr ( VI ) ions were mixed in aqueous solutions and adsorbed on DE81-DEAE cellulose paper, a weakly basic anion exchanger with diethylaminoethyl functional groups. Then the filter samples were measured by PIXE using 2.5 MeV proton beams. We obtained a LOD of 0.16 µg or 8 ppb for 20 mL samples at a proton energy of 2.5 MeV and a Mylar film thickness of 50 or 100 µm. The experimental results on the mixed solutions indicated that NO 3-, Cl -, and F - as coexisting ions didn't interfere significantly with determination of a 50 µ g / L Cr ( VI ) concentration for 40 mL total solution volume, despite the total amount of anions was about 90% of ion exchange capacity of a filter. On the other hand, slight interferences by PO 43- ions were observed. However, under the same condition, we found that if the total amount of SO 42- ions was higher than 20% of ion exchange capacity, they induced significant interferences in determining Cr ( VI ).

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