Quality control standard, QCSTD-27, 100 mL. Contains: Al, Sb, As, Ba, Be, B, Cd, Ca, Cr, Co, Cu, Fe, Pb, Mg, Mn, Mo, Ni, K, Se, Si, Ag, Sr, Na, Tl, Ti, V & Zn at 100 mg/LQuality Control Standard, 100mL Contains: Al, Sb, As, Ba, Be, B, Cd, Ca, Cr, Co,