“…All certified major (Ca, Mg, K, Na, Si) and trace element (Al, As, B, Ba, Co, Cr, Cu, Fe, Ga, Li, Mn, Mo, Ni, Pb, all REEs, Sb, Sr, Th, Ti, U, V, Zn) concentrations of the SLRS-5 standard (e.g., Yeghicheyan et al, 2013) and the measured concentrations agreed with an uncertainty of ±10 to ±20%. The agreement for Cd, Cs and Hf was between 30 and 50%.…”