Certified Reference Material (CRM).

1000 g/L each of Ca, Fe, K, Mg, Na, Sr, 10 g/L each of Ag, Al, As, Ba, Be, Cd, Co, Cr, Cu, Mn, Mo, Ni, Pb, Sb, Se, Tl, V, Zn, Th, U in HNO₃ 10%