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Table 6. (Continued) <br />Sample (units), tin species, Concentrationa Referenceb <br />and other variables <br />FRESHWATER (ug/1) <br />Total tin <br />Drinking water Usually <1.0, Max. 30.0 9 <br />Great Lakes <br />Subsurface Max. 1.2 1 <br />Surface microlayer Max. 24.9 1 <br />Inorganic tin <br />Canadian marinas, 1982-1984 <br />Lake St. Clair 6.7 10 <br />Whitby 37.2 10 <br />Port Hope 9.9 10 <br />Methyltin <br />Canada <br />Marina 1.2 11 <br />Harbors, lakes, rivers (0.06-1.0) 7 <br />USA rivers <0.002 7 <br />German rivers <0.08 7 <br />Florida lakes, ponds, rivers <0.012 7 <br />Dimethyltin <br />Canadian marina Max. 0.4 11 <br />USA rivers 0.004 7 <br />German rivers Max. 0.26 7 <br />Florida lakes, ponds, rivers <0.008 7 <br />Trimethyltin <br />Canadian marina Max. 0.05 11 <br />Lake Superior 0.05 7 <br />USA rivers 0.002 7 <br />German rivers 0.002 7 <br />Florida lakes, ponds, rivers <0.008 7 <br />Butyltin <br />Canada <br />Marinas <br />Whitby 0.62 10 <br />Port Hope 0.42 10 <br />Lake St. Clair 8.5 11 <br />23