21 Water Quality Parameters 15

21 Water Quality Parameters 15 - Most lakes and streams...

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pH and Acid Rainfall
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Natural rainfall is acidic: pH 5.6 CO 2 + H 2 O = H 2 CO 3 H 2 CO 3 => H + + HCO 3 - Acid Pollution by sulfur dioxide and nitrogen oxides contributes additional acidity to rainfall. SO 2  + H 2 O   H 2 SO4 
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The Canadian government has estimated that 14,000 lakes in eastern Canada are acidic. National Surface Water Survey (EPA) Investigated the effects of acidic deposition in over 1,000 lakes Acid rain caused acidity in 75 percent of the acidic lakes and about 50 percent of the acidic streams Adirondacks and Catskill Mountains mid-Appalachian highlands Little Echo Pond has a pH of 4.2.
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Unformatted text preview: Most lakes and streams have a pH between 6 and 8. In the Northeast U.S. many lakes have pH less than 5. Acid tolerances Increasing acidity food As acid rain flows through soils in a watershed, aluminum is released Low pH can be directly toxic to fish and other species Low pH and increased aluminum levels cause chronic stress that may not kill individual fish, but leads to lower body weight and smaller size and makes fish less able to compete for food and habitat. At pH 5, most fish eggs cannot hatch...
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21 Water Quality Parameters 15 - Most lakes and streams...

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