ICP Multi-element (20) Standard Ca,Na,Al,Fe @5000ppm, K,Mg,P @500ppm, Zn @200ppm, Mn @100ppm, As,Cr,Cu,Ni,Se,Pb,V @20ppm, Co @10ppm, Sn @5ppm, U,Cd @2ppm in 2-5% HNO3