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EAU TAMPONNEE [1 record]

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Record 1 2004-02-16

English

Subject field(s)
  • Analytical Chemistry
  • Water Pollution
CONT

The poisonous effect of sulphuric acid is primarily due to its acidity. While a pH of 4.0 has caused gill irritation, pH 3.5 has caused death in sunfish, bass and carp. As a consequence of this pH effect, a quantity of acid that would be lethal in soft water could be rendered harmless in hard or highly buffered water.

CONT

Buffered water means the pH is stable.

French

Domaine(s)
  • Chimie analytique
  • Pollution de l'eau
CONT

Le pH représente la concentration d’ions hydrogène(H+) et détermine si l'eau est basique ou acide. En ce qui a trait aux eaux douces du Saint-Laurent, la masse d’eau des Grands Lacs a une alcalinité moyenne de 89, 6 mg/L de CaCO3 et un pH moyen de 8, 2, ce qui indique une eau tamponnée, légèrement basique [...]

CONT

[...] une eau tamponnée par des ions bicarbonates freine la vitesse de décomposition de l'ozone, la dégradation des précurseurs de THM [trihalométhanes] s’en trouve donc augmentée.

Spanish

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