Analyte: Lithium carbonate (ICP grade) (as lithium), CAS Number: 554-13-2; Analyte: Ammonium chloride (as ammonium), CAS Number: 12125-02-9; InChl: NLXLAEXVIDQMFP-UHFFFAOYSA-N; Analyte: Sodium carbonate (as sodium), CAS Number: 497-19-8; InChl: CDBYLPFSWZWCQE-UHFFFAOYSA-L; Analyte: Potassium nitrate (ICP grade) (as potassium), CAS Number: 7757-79-1 . EPA, Method: 300; EPA, Method: 300.1; EPA, Method: 9056A.