Analyte: Sodium nitrate (ICP grade) (as sodium), CAS Number: 7631-99-4; Analyte: Magnesium nitrate hexahydrate (ICP grade) (as magnesium, CAS Number: 13446-18-9; Analyte: Aluminum nitrate nonahydrate (ICP grade) (as aluminum), CAS Number: 7784-27-2; Analyte: Calcium carbonate (ICP grade) (as calcium), CAS Number: 471-34-1; Analyte: Iron (III) nitrate, ferric nitrate (ICP grade) (as iron), CAS Number: 7782-61-8 ; . EPA, Method: 200.7 Rev 3.3; EPA, Method: 200.7 Rev 4.4; EPA, Method: 6010C.