Prepared from Lake Ontario water, filtered, diluted and preserved with 0.2% nitric acidCertified valuesAg . 3.3 mg/LCr.4.7 mg/LPb . 4.1 mg/LAl. 47 mg/LCu.6.2 mg/LSb . 3.1 mg/LAs. 5.8 mg/LFe .17 mg/LSe . 36 mg/LBa . 15.7 mg/LLi.3.6 mg/LSr . 50.8 mg/LBe . 2