Inorganic Ventures' Quality Control Standard 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 = 25 µg/mL As = 200 µg/mL B = 100 µg/mL Ba = 100 µg/mL Be = 100 µg/mL Ca = 100 µg/mL Cd = 100 µg/mL Ce = 100 µg/mL Co = 100 µg/mL Cr = 100 µg/mL Cu = 100 µg/mL Fe = 100 µg/mL Hg = 200 µg/mL K = 500 µg/mL Li = 100 µg/mL Mg = 100 µg/mL Mn = 100 µg/mL Na = 100 µg/mL Ni = 100 µg/mL P = 500 µg/mL Pb = 200 µg/mL Se = 100 µg/mL Sr = 100 µg/mL Tl = 500 µg/mL V = 100 µg/mL Zn = 100 µg/mL