TERMIUM Plus®

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

PRINCIPAL ION [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 1998-02-05

English

Subject field(s)
  • Chemistry
DEF

[In mass spectroscopy], a molecular or fragment ion made up of the most abundant isotopes of each of its atomic constituents.

OBS

In the case of compounds that have been artificially isotopically enriched in one or more positions ... the principal ion may be defined by treating the heavy isotopes as new atomic species.

French

Domaine(s)
  • Chimie
DEF

[En spectroscopie de masse], [...] ion moléculaire ou [...] ion fragment constitué des isotopes les plus abondants de chacun de ses constituants atomiques.

OBS

Dans le cas de composés ayant isotopiquement été enrichis artificiellement dans une ou plusieurs positions; [...] l'ion principal doit être défini en considérant les isotopes lourds comme de nouvelles espèces atomiques.

Spanish

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Record 2 1985-09-18

English

Subject field(s)
  • Air Pollution
CONT

At times the network comprised as many as 175 stations in Northern and Western Europe from which monthly samples of precipitation were analysed not only for acidity but also for the concentrations of a number of major ions.

French

Domaine(s)
  • Pollution de l'air
DEF

Cations ou anions qui déterminent, par le rôle prépondérant qu'ils jouent, l'équilibre acido-basique d'un écosystème.

CONT

Il est recommandé (...) que l'ensemble des ions majeurs et certains métaux traces soient mesurés autant que possible afin d'identifier les sources de pollution et les mécanismes de formation de l'acidité.

CONT

A partir des rapports qui existent entre les concentrations en chlorures et en ions majeurs dans l'eau de mer, il est possible d'estimer l'apport des sels marins dans les eaux des rivières considérées.

Spanish

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TERMIUM Plus®, the Government of Canada's terminology and linguistic data bank
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