Abstract
Measurements of sulphate concentration in precipitation from individual snow storms of several hours duration in the Western Lake Ontario region indicate that approximately 9–66 mg M−2 of SO is being deposited into the Lake per storm. This amount is up to several times more than daily average values over long periods found by other workers. Using a mean sulphate concentration of 4 mg l−1 and an annual accumulation of precipitation of 760 mm, the yearly sulphate deposition by precipitation is about 0.1 % of the total mass of sulphate in the Lake; however, more significantly, it is of the same order of magnitude as that discharged directly into the Lake by industry.
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