Certified Reference Material (CRM).

100 mg/L each of Cd, Ni, Zn, 60 mg/L Sb, 50 mg/L each of Ba, Be, Co, Cr, Cu, Mn, V, 20 mg/L Ag, 10 mg/L each of As, Tl, 5 mg/L each of Pb, Se in HNO₃ 5%