Certified Reference Material (CRM).

21215 mg/L Cl^-, 3000 mg/L Ca, 2500 mg/L each of Fe, Na, 2000 mg/L C, 1000 mg/L each of Al, K, Mg, P, S, 20 mg/L each of Mo, Ti in Nitric Acid 5% in HNO₃ 5%