Baseline Studies of the Clay Minerals Society Source Clays: Cation Exchange Capacity Measurements by the Ammonia-Electrode Method

2001 ◽  
Vol 49 (5) ◽  
pp. 444-445 ◽  
Author(s):  
D. Borden
Keyword(s):  
Cation Exchange ◽  
Clay Minerals ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
Electrode Method ◽  
Source Clays ◽  
Ammonia Electrode

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.

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.

INFLUENCE OF CLAY MINERALS ON MICROORGANISMS: III. EFFECT OF PARTICLE SIZE, CATION EXCHANGE CAPACITY, AND SURFACE AREA ON BACTERIA

1966 ◽  
Vol 12 (6) ◽  
pp. 1235-1246 ◽  
Author(s):  
G. Stotzky
Keyword(s):  
Particle Size ◽  
Cation Exchange ◽  
Surface Area ◽  
Clay Minerals ◽  
Cation Exchange Capacity ◽  
Physicochemical Characteristics ◽  
Exchange Capacity ◽  
Bacterial Respiration ◽  
Effect Of Particle Size ◽  
Stimulation Of

The stimulation of bacterial respiration by clay minerals was related to certain physicochemical characteristics of clays. Respiration increased with an increase in the cation exchange capacity and surface area of the particles. The importance of surface area, however, could not be unequivocally established, as some of the methods used to determine this characteristic on certain clay species were questionable. Particle size did not appear to be a critical characteristic. The implications of the cation exchange capacity of clay minerals in the activity, ecology, and population dynamics of microorganisms in nature are discussed.

scholarly journals Properties of saline soils in Iraq.

1962 ◽  
Vol 10 (3) ◽  
pp. 194-210
Author(s):  
P. Delver
Keyword(s):  
Hydraulic Conductivity ◽  
Cation Exchange ◽  
Clay Minerals ◽  
Soil Texture ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
Saline Soils ◽  
Exchange Reactions ◽  
Temporary Decrease ◽  
The Relationship

Data on soil texture, lime, gypsum, cation-exchange capacity, salinity, alkalinity, hydraulic conductivity and their interrelations and variations are discussed. An equation expresses the relationship between exchangeable Na and cations soluble in 1: 1 extracts. Special attention is paid to whether alkalization and structure deterioration will occur during reclamation. Gypsum contents seem to be adequate for replacement of Na by Ca during leaching but temporary decrease in permeability in early stages of leaching may occur due to retarded exchange reactions caused by the nature of the clay minerals. (Abstract retrieved from CAB Abstracts by CABI’s permission)

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