Collected from Lake SuperiorCertified ValuespH . 7.72 F . 0.048 mg/L DIC . 9.95 mg/L K . 0.49 mg/L Specific conductance . 97 mS/cm Mg . 2.8 mg/L Totalalkalinity (as CacO3).42.3mg/L NO3 +NO2 (asN).0.343mg/L Totalhardness (as CaCO3 ).45.2mg/L Na. 1.35 mg/L