A comparison of extractants for the determination of cation exchange capacity and extractable cations by a mechanical vacuum extractor

1994 ◽  
Vol 25 (9-10) ◽  
pp. 1505-1515 ◽  
Author(s):  
Y. P. Kalra ◽  
D. G. Maynard
Keyword(s):  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
Vacuum Extractor ◽  
Extractable Cations

Determination of the Cation Exchange Capacity of Clays by Surface Tension Measurements

Clay Minerals ◽  
1993 ◽  
Vol 28 (3) ◽  
pp. 475-481 ◽  
Author(s):  
G. Burrafato ◽  
F. Miano
Keyword(s):  
Surface Tension ◽  
Cation Exchange ◽  
Clay Minerals ◽  
Cation Exchange Capacity ◽  
Mixing Time ◽  
Aqueous Suspension ◽  
Exchange Capacity ◽  
Drilling Fluids ◽  
Accurate Analysis

AbstractThe cation exchange capacity (CEC) of clay minerals has been determined by titration of aqueous suspension of clays with hexadecylpyridinium chloride, monitored using surface tension measurements. In order to make the method suitable for an accurate analysis of the CEC of the clays in drilling fluids or in soils, some parameters affecting the CEC determination (e.g. the presence of carboxymethylcellulose, mixing time and measurement device) have been investigated.

INCREASE IN NEUTRAL SALT EXTRACTABLE CATION EXCHANGE CAPACITY OF SOME ACID SOILS AS AFFECTED BY CaSO4 APPLICATIONS

1984 ◽  
Vol 64 (2) ◽  
pp. 153-161 ◽  
Author(s):  
S. SHAH SINGH
Keyword(s):  
British Columbia ◽  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Acid Soils ◽  
Exchange Capacity ◽  
Neutral Salt ◽  
Activity Product ◽  
Three Samples ◽  
Ion Activity ◽  
Extractable Cations

The equilibration of acid soils, a Sombric Ferro-Humic Podzol (CSSC-2) from British Columbia, an Orthic Ferro-Humic Podzol (CSSC-19) from Quebec and two horizons of a Dystric Brunisol (SSD-330, SSD-331) from British Columbia, with CaSO4 solution demonstrated that SO4 ions reacted with components of these soils. These reactions increased soil pH, ion activity product (Al)(OH)3 and neutral salt extractable exchangeable cations. The increase in pH and ionic activity product (Al)(OH)3 were noticeable on a single equilibration; however, increase in neutral salt extractable cations was only observed after subsequent equilibrations. After three equilibrations, the sums of NaCl extractable cations were 6.56, 11.99, 5.62 and 4.31 meq/100 g for soil samples CSSC-2, CSSC-19, SSD-330 and SSD-331, respectively. The corresponding values for the unequilibrated soils were 5.20, 7.49, 4.30 and 2.50 meq/100 g. On further equilibration there was no increase in total extractable cations for sample CSSC-2; however, for the other three samples there were increases which became progressively smaller. The reaction of SO4 ions with aluminum hydroxy clay complexes seems to be the mechanism for the increase of negative sites. Key words: Cation exchange capacity, CaSO4, acid soils

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