Results 241 to 250 of about 309,145 (305)

High‐Capacity Cation Exchangers

Journal AWWA, 1950
Generally speaking, all of the cation exchangers can be regenerated with common salt and used for removing calcium and magnesium from solutions. The organic cation exchangers, such as the carbonaceous zeolites and the synthetic resins, can also be regenerated with dilute acid solutions and, in the resulting hydrogen condition, they will remove all ...
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A new method for quantifying cation exchange capacity in clay minerals

Applied Clay Science, 2017
In this paper, a new method is proposed to theoretically quantify cation exchange capacity (CEC) of pure clay minerals, by use of nuclear magnetic resonance (NMR), X-ray diffraction (XRD), and nitrogen adsorption-desorption isotherm analysis.
Kai Cheng, Z. Heidari
semanticscholar   +1 more source

Cation Exchange Capacity and Exchangeable Aluminum in Natal Oxisols

Soil Science Society of America Journal, 1971
Abstract Positive charges in acid soils reduce CEC at low electrolyte concentration probably by double layer interaction. The resultant net ECE (determined by washing soil free of salt with water) is the effective CEC under field conditions and the difference between net CEC and exchangeable bases is accordingly a
N. G. Reeve, M. E. Sumner
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Unbuffered and Buffered Salt Methods for Exchangeable Cations and Effective Cation‐Exchange Capacity

Soil Science Society of America Journal, 1990
Abstract This study was conducted to determine if a single unbuffered salt extractant for exchangeable bases and Al could be used in place of a buffered salt extractant for exchangeable bases and an unbuffered salt extractant for exchangeable Al. Barium chloride and a mixed NH 4
M. C. Amacher, R. E. Henderson, M. D. Breithaupt, C. L. Seale, J. M. LaBauve   +4 more
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A simple rapid method for the measurement of exchangeable cations and effective cation exchange capacity

Communications in Soil Science and Plant Analysis, 1981
Abstract A simple single‐extraction procedure for measuring exchangeable cations and effective CEC (ECEC, the CEC at natural pH and ionic strength) has been developed for routine advisory soil analysis. The method is based on the use of Sr (1.26M SrCl2) to displace exchangeable cations and effective CEC is taken as the sum of the exchangeable cations ...
D.C. Edmeades, O.E. Clinton
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Studies on cation-exchange capacities of roots

Plant and Soil, 1960
1. Enzymic breakdown of pectin caused an initial rapid pH drift towards the acid side when hydrogen ion-saturated roots were neutralised.
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Cation exchange capacity of roots: Titration, sum of exchangeable cations, copper adsorption

Journal of Plant Nutrition, 1986
Abstract The cation exchange capacity of roots (CECR) has been measured according to three different methods : titration of H‐roots with NaOH in the presence of CaCl2, MgCl2, or NaCl 0.1 N, saturation of roots with mixed Ca‐Mg‐Na solutions of eight different compositions and extraction of the adsorbed cations with copper, saturation of roots with Cu ...
J.E. Dufey, R. Braun
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A Simple Barium Chloride Method for Determining Cation Exchange Capacity and Exchangeable Cations

Soil Science Society of America Journal, 1986
Abstract Seventeen soil samples from acidic forest soils (Typic and Pergelic Cryorthods) and near‐neutral agricultural soils (Typic Haplaquepts) were used in an experiment to compare three methods of determining cation exchange capacity (CEC). The methods tested are the sum of cations displaced with 0.1
William H. Hendershot, Martin Duquette
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Separation of cations using methacrylate-based low-capacity cation exchangers

Journal of Chromatography A, 1990
Abstract The possibility of using macroporous methacrylate-based low-capacity ion exchangers in the separation of cations of alkali, alkaline earth, transition and heavy metals was tested. The separation conditions were optimized with respect to the composition of the eluent (content of ethylenediamine, tartaric acid, organic solvent and pH).
J. Hradil, F. Švec, A.A. Aratskova, L.D. Beljakova, V.I. Orlov   +4 more
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The measurement of cation exchange capacity of soils

Journal of the Science of Food and Agriculture, 1976
AbstractThe implications of the different methods available for measuring the cation exchange capacity (CEC) of soils are examined in the light of cation exchange mechanisms, and the issues involved in selecting a suitable method are discussed.
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