20 ppm: As, Be, Cd, Zn; 10 ppm: Mg, Ni, Pb; 5 ppm Al, Ba, Bi, Co, Cr, Cu, In, Li 6+ , Lu, Mn, Na, Sc, Sr Th, U, V; 2.5 ppm Y, Yb Matrix: 2% HNO3 Min: >= 4.975 Max: = Manufactured and Tested in an ISO 17025/Guide 34