Perkin Elmer Pure 4 (Quality Control Standard 23) – 23 components; Ag, Al, B, Ba, Bi, Ca, Cd, Co, Cr, Cu, Fe, Ga, In, K, Li, Mg, Mn, Na, Ni, Pb, Sr, Tl, Zn @ 1000ug/ml in 10% HNO3, 500mL