Analyte: Beryllium acetate (ICP grade) (as beryllium), CAS Number: 543-81-7; Analyte: Magnesium nitrate hexahydrate (ICP grade) (as magnesium, CAS Number: 13446-18-9; Analyte: Iron (III) nitrate, ferric nitrate (ICP grade) (as iron), CAS Number: 7782-61-8; Analyte: Nickel (II) nitrate hexahydrate (ICP grade) (as nickel), CAS Number: 13478-00-7; Analyte: Thallium (I) nitrate (ICP grade) (as thallium), CAS Number: 10102-45-1; Analyte: Lead (II) nitrate (ICP grade) (as lead), CAS Number: 10099-74-8 . EPA, Method: 200.7 Rev 3.3; EPA, Method: 200.7 Rev 4.4.