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SO4-- [3 records]

Record 1 2011-01-18

English

Subject field(s)
  • Chemistry
Universal entry(ies)
Ca++
formula, see observation
Ca2+
formula, see observation
CONT

Here the important ions added are the ones most abundant in seawater, namely the cations Na+ and Mg++(sodium and magnesium), the anion Cl-(chloride) and to a lesser extent cations of calcium and potassium(Ca++, K+) and anions of sulfate(SO4--).

CONT

To be acidic rain must also have more sulphate(SO4=) and nitrate(NO3-) anions as compared to calcium(Ca++) and magnesium(Mg++) cations for example. The excess anions are then balanced by hydrogen ions(H+) making rain acid.

OBS

Every cation is necessarily an ion; an ion must be either an anion or a cation.

OBS

Chemical formula: Ca++ or Ca2+

OBS

Compare "calcium ion," which is a more general term.

French

Domaine(s)
  • Chimie
Entrée(s) universelle(s)
Ca++
formula, see observation
Ca2+
formula, see observation
CONT

Le taux du calcium sanguin ou calcémie (100 mg/l) est une constante biologique. Elle est le reflet de l'équilibre métabolique de ce cation dans l'organisme [...] Enfin l'ion Ca2+ est l'effecteur d'enzymes protéolytiques comme la trypsine ou les thromboplastiques.

OBS

Formule chimique : Ca++ ou Ca2+

OBS

Pluriel : des cations calcium.

Spanish

Save record 1

Record 2 2003-12-11

English

Subject field(s)
  • Air Pollution
CONT

A model has been developed that relates the cation denudation rate(CDR) of a watershed(the rate that cations derived from chemical weathering are carried off by runoff), the atmospheric load of excess SO4--, and the pH of the river.

French

Domaine(s)
  • Pollution de l'air
DEF

Taux qui se fonde sur la vitesse à laquelle les cations disparaissent d'un bassin versant et qui sert à indiquer le degré d'actification anthropique de ce bassin.

CONT

En étudiant les taux d'appauvrissement en cations et le régime hydrologique de ces rivières, Thompson et Bennett (1980) ont pu déduire que le pH moyen des précipitations atmosphériques en 1973 devait se situer vers 4.1 ou 4.2. Ou, en d'autres termes, la charge d'ions H+ dans le sud de la Nouvelle-Écosse devait se situer aux environs de 110 meq/m2 et, dans le bassin de la rivière Isle-aux-Morts, aux environs de 130 meq/m2.

OBS

Pour de plus amples renseignements sur cette notion, consulter le cahier de néologie sur les pluies acides (OLFNE 1985 no 40-41).

Spanish

Campo(s) temático(s)
  • Contaminación del aire
Save record 2

Record 3 1985-08-29

English

Subject field(s)
  • Chemical Elements and Compounds
  • Air Pollution
CONT

The ammonium ion(NH4+) in rain and snow tends to increase the pH. In coastal areas sea spray may contribute significantly to the chemistry of precipitation. Here the important ions added are the ones most abundant in seawater, namely the cations Na+ and Mg+(sodium and magnesium), the anion Cl-(chloride) and to a lesser extent cations ion of calcium and potassium(Ca++, K+) and anions of sulfate(SO4--).

French

Domaine(s)
  • Éléments et composés chimiques
  • Pollution de l'air

Spanish

Save record 3

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