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a M M s M s s M s M M M M M M M M Is <br /> Table 2. Bulk Concentration Range for Potassium and Sodium Oxides in Cement Kiln Dust (weight percent) <br /> (Long Dry Kilns and Dry Kilns with Pre-heater and/or Pre-calciner) <br /> Constituent Concentration Range <br /> K2O 0 2-9.7 <br /> Na2O 0.07-1.2 <br /> Source: Report to Congress on Cement Kiln Dust. USEPA Office of Solid Waste , 1993. <br />