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Numerous lakes in Scandinavia and eastern North America have been damaged by acidic precipitation induced by anthropogenic oxides of sulphur and nitrogen. On first approximation, lakes near present oil sands operations would not be susceptible to acidification due to buffering provided by their sedimentary setting. However, due to the planned increases in oil sands developments along with increased regional outputs of oxides of sulphur and nitrogen, a definitive study with the objective of assessing the susceptibility of nearby lakes to acidification was desired. Accordingly this study was initiated in 1976.