NOTE ON THE USE OF FLOODING SOLUTIONS IN THE DETERMINATION OF METALLIC EXCHANGEABLE CATIONS, UTILIZING A BECKMAN DU FLAME SPECTROPHOTOMETER

1962 ◽  
Vol 42 (2) ◽  
pp. 317-318 ◽  
Author(s):  
J. A. Carson ◽  
A. L. Mathieu ◽  
M. D. Scheelar
Keyword(s):  
Exchangeable Cations

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scholarly journals Mechanical dispersion of clay from soil into water: readily-dispersed and spontaneously-dispersed clay

2015 ◽  
Vol 29 (1) ◽  
pp. 31-37 ◽  
Author(s):  
Ewa A. Czyż ◽  
Anthony R. Dexter
Keyword(s):  
Qualitative Method ◽  
Empirical Equation ◽  
Soil Samples ◽  
Exchangeable Cations ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
Mechanical Dispersion ◽  
Energy Inputs ◽  
Water Contents

Abstract A method for the experimental determination of the amount of clay dispersed from soil into water is described. The method was evaluated using soil samples from agricultural fields in 18 locations in Poland. Soil particle size distributions, contents of organic matter and exchangeable cations were measured by standard methods. Sub-samples were placed in distilled water and were subjected to four different energy inputs obtained by different numbers of inversions (end-over-end movements). The amounts of clay that dispersed into suspension were measured by light scattering (turbidimetry). An empirical equation was developed that provided an approximate fit to the experimental data for turbidity as a function of number of inversions. It is suggested that extrapolation of the fitted equation to zero inversions enables the amount of spontaneously-dispersed clay to be estimated. This method introduces the possibility of replacing the existing subjective, qualitative method of determining spontaneously-dispersed clay with a quantitative, objective method. Even though the dispersed clay is measured under saturated conditions, soil samples retain a ‘memory’ of the water contents at which they have been stored.

scholarly journals Determination of Exchangeable Cations in Soils Affected by Different Types of Salt Accumulation

2012 ◽  
Vol 45 (2) ◽  
pp. 135-142 ◽  
Author(s):  
Ye-Jin Lee ◽  
Hong-Bae Yun ◽  
Rog-Young Kim ◽  
Jong-Sik Lee ◽  
Yo-Sung Song ◽  
...  
Keyword(s):  
Exchangeable Cations ◽  
Salt Accumulation ◽  
Different Types

The determination of exchangeable cations in acid soils: Errors caused by weathering reactions during neutral salt extraction

1991 ◽  
Vol 71 (2) ◽  
pp. 155-163 ◽  
Author(s):  
Pat E. Rasmussen ◽  
Sherry L. Schiff ◽  
H. Wayne Nesbitt
Keyword(s):  
Acid Soils ◽  
Exchangeable Cations ◽  
Neutral Salt ◽  
Salt Extraction ◽  
Exchangeable Acidity ◽  
Aluminum Hydroxides ◽  
Exchangeable Al ◽  
Acid Forest Soils ◽  
Series Of Experiments

To investigate pH-controlled chemical reactions associated with the neutral salt measurement of exchangeable cations in acid soils, and to estimate the potential error caused by such reactions, a series of experiments was performed which modify an established BaCl2 extraction method. Results showed that dissolution of amorphous silica, aluminum hydroxides and organic material occurs during neutral salt extraction, contributing cations to solution which are indistinguishable from exchangeable cations. As a result overestimates of exchangeable Al and Ca occur, but the error is not significant (> 10%) except in certain Ae horizons which are low in total CEC and high in exchangeable acidity. The 2-h BaCl2 method is recommended over the 4-hour NaCl method to minimize interference from weathering reactions. Key words: Cation exchange, exchangeable acidity, Al, H, acid forest soils, weathering

Refinement of framework disorder in dehydrated CaA zeolite from single-crystal synchrotron data

2000 ◽  
Vol 56 (5) ◽  
pp. 766-772 ◽  
Author(s):  
Florence Porcher ◽  
Mohamed Souhassou ◽  
Heinz Graafsma ◽  
Anna Puig-Molina ◽  
Yves Dusausoy ◽  
...  
Keyword(s):  
High Resolution ◽  
Single Crystal ◽  
Catalytic Properties ◽  
Exchangeable Cations ◽  
Mirror Plane ◽  
X Ray Diffraction ◽  
X Ray ◽  
Zeolite Structure ◽  
Accurate Knowledge

An accurate knowledge of zeolite structure is required for understanding their selective sorption capacities and their catalytic properties. In particular, the positions of the exchangeable cations and their interactions with the framework are essential. The present study deals with the accurate crystal structure determination of a fully exchanged and fully dehydrated CaA zeolite (Ca48Al96Si96O384, Fm\bar 3c, a = 24.47 Å) using single-crystal high-resolution synchrotron X-ray diffraction [(sin θ/λ)max = 1.4 Å−1]. It is shown that cation exchange severely distorts the skeleton, especially around the O2 atom. The high-resolution synchrotron data reveal that this latter O atom is disordered and lies out of the mirror plane it occupies in other A-type zeolites. This feature is related to that observed for Ca2+ cations.

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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