Cation-exchange capacity is defined as the amount of positive charge that can be exchanged per mass of soil, usually measured in cmol c /kg. Some texts use the older, equivalent units …

The total number of cations a soil can hold--or its total negative charge--is the soil's cation exchange capacity. The higher the CEC, the higher the negative charge and the more cations …

What are exchangeable cations? The clay mineral and organic matter components of soil have negatively charged sites on their surfaces which adsorb and hold positively charged ions …

What is Cation Exchange (cont.)? Cation adsorption strength Cations are held with different strengths on the soil exchange sites More strongly held cations accumulate as soils weather …

The capacity of the soil to hold on to these cations called the cation exchange capacity (CEC). These cations are held by the negatively charged clay and organic matter particles in the soil …

Oct 27, 2025 · Cation exchange is a reversible chemical process involving the interchange of positively charged ions (cations) between a solid material and a surrounding liquid solution.

Jun 17, 2025 · Cation Exchange Capacity (CEC) in soil is the soil’s ability to hold and exchange positively charged ions (cations) with the soil solution, acting as a reservoir of nutrients readily …

Feb 26, 2014 · The adsorbed cations may easily exchange with other cations in the soil solution, hence the term “cation exchange.” The adsorbed cations replenish the ions in the soil solution …

CEC stands for cation exchange capacity, the total amount of cations a soil can retain, measured in cmol c /kg (or meq/100g, but here we’ll stick with cmol c /kg).

Cation exchange chromatography is used both for preparative and analytical purposes and can separate a large range of molecules from amino acids and nucleotides to large proteins.