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This study was conducted to determine if mercury is being released to the atmosphere from an inland waterway (the Wabigoon River system of N.W. Ontario, Canada) known to be contaminated with this metal from industrial wastewater discharges. Chemical and meteorological data were collected at three sites over a 3-week, period during the summer of 1986. At each site, simultaneous measurements were performed of total vapour-phase Hg over water and over an adjacent land surface. A sparger device was used to probe for the presence of volatile forms of mercury dissolved in the water.