Water, Air, and Soil Pollution

, Volume 25, Issue 2, pp 115–132 | Cite as

Sensitivity of southern quebec lakes to acidic precipitation

  • Marius Lachance
  • Bernard Bobée
  • Yves Grimard


Physico-chemical data from 258 Quebec lakes were collected during spring and summer 1980. These data are examined in order obtain a first general diagnosis of lake acidification in Quebec. The spatial variation of the mineralization of lakes is interpreted in relation to lithology and glacial deposits, allowing the identification of Shield areas particularly threatened by acid precipitation. A strong south-west to north-east gradient in sulphate concentration is observed and interpreted as a result of long range atmospheric transport of S and as an indication of increased sulphate levels in southern Quebec lakes. The frequency distribution of pH values and the relation between pH and sulphate are examined; the results obtained suggest that many Shield lakes are probably affected by acid precipitation. A comparison is made between spring and summer conditions; data obtained in spring show a substantial decrease in pH and alkalinity.


Lithology Alkalinity Long Range Sulphate Concentration Substantial Decrease 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© D. Reidel Publishing Company 1985

Authors and Affiliations

  • Marius Lachance
    • 1
  • Bernard Bobée
    • 1
  • Yves Grimard
    • 2
  1. 1.INRS-Eau, Université du Québec.Sainte-FoyCanada
  2. 2.Quebec Ministry of EnvironmentSainte-FoyCanada

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