. L'affaire contre la pluie : un rapport sur les précipitations acides et les programmes de l'Ontario de prendre des mesures correctives.. ---. Les pluies acides. FIG. 16 "Dépression" du pH d'un flux graphique illustrant "dépression" du pH dans l'un des six cours d'eau tributaires du lac Harp pour une étude, comme le lac Muskoka m ruissellement au printemps augmente la quantité de l'eau, l'acidité de la neige fondue provoque la chute du pH à la production, "choc" chimiques graves effets sur la vie aquatique. 15,0 4s 10.0. 6,50 X 600 - 5,50 15 mars 20 avril comme la pluie acide est neutralisée, une partie du sol et de roches est dissoute. Si t

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. The Case against the rain : a report on acid precipitation and Ontario programs for remedial action.. --. Acid rain. FIG. 16 "Spring pH Depression" of a Stream Graph illustrating "spring pH depression" in one of the six inflowing streams to Harp Lake, a study lake m Muskoka As the spring runoff increases the amount of water, the acidic melted snow causes the stream pH to drop, producing severe chemical "shock" effects on aquatic life. 15, 0 4S 10.0. 6, 50 X 600 - 5.50 March 15 20 April As the acid rain is neutralized, some soil and rock material is dissolved. If the acid rain lands on lime- stone, the runoff will contain calcium sulphate and calcium nitrate — both quite harmless substances. Precambrian rock can slowly neutralize acid rain but instead of calcium, it releases aluminum, manganese, iron, and other metals which can build up to concen- trations which are toxic to fish and other forms of aquatic life. In areas of Precambrian rock and little soil cover, which is the situation in much of northern Ontario, there is not enough buffering capacity to neutralize even small amounts of acid falling on the soil. As a result, the runoff water is acidic. The effect shows up at different times in streams entering the same lake because the process of acidifi- cation of runoff is quite irregular. For example, a light acid rain may be fully neutralized while the runoff during a heavy rain on the same watershed will not have time to be neutralized so a "pulse" of acidic water will move down the stream and into the lake. The stream will have normal pH values shortly after the surge of water passes. But the aquatic organisms living in the stream will have been subjected to a very severe chemical shock. Acids falling in snow accumulate during the winter. When the snow melts there is a relatively sudden release of a large amount of acids in the runoff. The soils are usually frozen and there is very little chance for the acids to be neu

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