Mercury in water samples, at levels below parts per billion, was collected by dithizone flotation. The statistical detection limit of Hg in seawater was 4 times better than that with a hydrous iron oxide #x2013;-APDC flotation system in neutron activation determination. The same floated dithizone precipitate can be used repeatedly for collection from several volumes of the water sample. The Hg content in seawater was 0.017 #x3BC;g/L. Average recovery from waters containing 0.025#x3BC;g/L, 0.05 #x3BC;g/L and 0.1 #x3BC;g/L was 98. The method was applied successfully to the determination of Hg in NBS 1641b. Methyl mercury is also collected by the procedure described.
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