Inorganic Ventures' Laboratory Fortified Stock Solution 1 is a 125mL certified reference material set in a nitric acid matrix for stability. This standard is Traceable to NIST and manufactured in accordance with our stringent Quality Assurance guidelines. One year Expiration Date. Analytes: Ag = 8 µg/mL As = 80 µg/mL B = 30 µg/mL Ba = 20 µg/mL Be = 20 µg/mL Ca = 100 µg/mL Cd = 20 µg/mL Ce = 200 µg/mL Co = 20 µg/mL Cr = 40 µg/mL Cu = 30 µg/mL Fe = 300 µg/mL Hg = 70 µg/mL K = 1000 µg/mL Li = 20 µg/mL Mg = 200 µg/mL Mn = 20 µg/mL Na = 300 µg/mL Ni = 50 µg/mL P = 600 µg/mL Pb = 100 µg/mL Se = 200 µg/mL Sr = 20 µg/mL Tl = 200 µg/mL V = 30 µg/mL Zn = 20 µg/mL