TERMIUM Plus®

The Government of Canada’s terminology and linguistic data bank.

EXCHANGE CAPACITY [4 records]

Record 1 2005-12-13

English

Subject field(s)
  • Geochemistry
  • Soil Science
DEF

The total amount of exchangeable cations that a soil can adsorb.

CONT

Within the soil there are metallic as well as hydrogen cations. There is an equilibrium between the cations and the negatively charged colloids on which they are absorbed. The total amount absorbed is called the cation exchange capacity or CEC and varies especially with the clay content and the amount of organic matter. The proportion of the metallic cations in the total CEC of the soil is the base saturation, which may afford a suitable measure of the acidity of the soil. There have been numerous methods used to determine the CEC and the base saturation of soils.

OBS

... It is expressed in milliequivalents per 100 g of soil or other adsorbing materials such as clay.

French

Domaine(s)
  • Géochimie
  • Science du sol
DEF

Quantité totale de cations échangeables que le sol peut adsorber.

CONT

[...] l'ère industrielle est venue accentuer le processus d'acidification des sols par son apport additionnel de dépôts acides. Certains effets ont été observés à partir d'expériences menées en laboratoire et dans des écosystèmes forestiers : [...]. La capacité d'échange cationique du sol (CEC), c'est-à-dire la capacité du sol à retenir les cations, diminue avec l'augmentation de l'acidité.

Spanish

Campo(s) temático(s)
  • Geoquímica
  • Ciencia del suelo
DEF

Capacidad de un suelo para absorber un número máximo de cationes intercambiables, medida en miliequivalentes/100 g de suelo.

Save record 1

Record 2 2003-09-19

English

Subject field(s)
  • Chemical Engineering
CONT

The exchange capacity is the quantity of ions (cations or anions as the case may be) contained in one litre of ion exchange material and exchangeable for other ions.

French

Domaine(s)
  • Génie chimique
CONT

On appelle pouvoir d'échange la quantité d'ions (cations ou anions suivant les cas) contenue dans 1 litre d'échangeurs d'ions et susceptibles d'être échangés contre d'autres ions.

Spanish

Campo(s) temático(s)
  • Ingenieria química
Save record 2

Record 3 2003-09-19

English

Subject field(s)
  • Soil Science
DEF

The total ionic charge of the adsorption complex that is active in the adsorption of ions.

French

Domaine(s)
  • Science du sol
DEF

Charge ionique totale du complexe d'adsorption qui joue un rôle dans l'adsorption d'ions.

Spanish

Campo(s) temático(s)
  • Ciencia del suelo
DEF

Carga iónica del complejo de adsorción activo en la adsorción de iones, expresada en miliequivalentes de cationes o aniones por cada 100 g de suelo u otro material adsorbente.

Save record 3

Record 4 2003-09-19

English

Subject field(s)
  • Analytical Chemistry
CONT

The exchange capacity of a resin is the total number of equivalents of replaceable hydrogen per unit volume per unit weight of resin, and is determined by the number and strength of fixed ionic groups on the resin. The ion exchange capacity affects solute retention, and exchangers of high capacity are most often used for separating complex mixtures, where increased retention improves resolution.

French

Domaine(s)
  • Chimie analytique
DEF

[...] nombre de groupements fonctionnels accessibles à l'échange d'ions par unité de masse ou de volume d'échangeur [;] [elle] est constante et indépendante du pH.

Spanish

Campo(s) temático(s)
  • Química analítica
Save record 4

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