Preliminary Chemical Characterization of Waters in the Experimental Lakes Area, Northwestern Ontario

摘要: Water analyses in 1968 and 1969 from 40 small lakes within a area of the Canadian Shield northwestern Ontario gave mean values for Ca, Na, Mg, K 1.6, 0.9, 0.4 mg/liter with Ca > Na > Mg > K on molar basis. HCO3, SO4, Cl (on smaller number samples) were 4.1, 3.0, 1.4 mg/liter. Total CO2 was variable range 0.3–12.0 mg/liter. Specific conductance 10–35 μmho/cm at 25 C pH 5.4–7.5. Color < 5–150 Hazen units, plant pigments (as chlorophyll a) < 1–21 μg/liter. dissolved nitrogen 110–300 mg N/liter total phosphorus 3–20 μg P/liter. NO3-N PO4-P often undetectable summer, reached winter maxima around 100 10 μg/liter.Total contents five computed beginning end periods several weeks during summer stagnation. Changes negligibly three deeper lakes, but two shallowest showed increases 0.22 0.62 ...