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CAS#: 7631-99-4 | Formula: NaNO3 | Specifications: Assay 99.0 % - Min, Calcium 0.005 % Max, Chlorine(Total) (%) 0.0001 % Max, Heavy Metals (by ICP-OES) 0.0005 % Max, Insoluble 0.005 % Max, Iodate 0.0005 % Max, Iron 0.0003 % Max, Magnesium 0.002 % Max, Nitrite 0.001 % Max, pH of 5% Solution (pH) 5.5 - 8.3 pH, Phosphate 0.0005 % Max, Sulfate 0.003 % Max