Inorganic Ventures' Quality Control Standard 28 is a 125mL certified reference material set in a nitric acid / hydrofluoric 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 = 100 µg/mL As = 100 µg/mL B = 100 µg/mL Ba = 100 µg/mL Be = 100 µg/mL Ca = 100 µg/mL Cd = 100 µg/mL Co = 100 µg/mL Cr = 100 µg/mL Cu = 100 µg/mL Fe = 100 µg/mL K = 1000 µg/mL Li = 100 µg/mL Mg = 100 µg/mL Mn = 100 µg/mL Mo = 100 µg/mL Na = 100 µg/mL Ni = 100 µg/mL Pb = 100 µg/mL Sb = 100 µg/mL Se = 100 µg/mL Si = 50 µg/mL Sr = 100 µg/mL Ti = 100 µg/mL Tl = 100 µg/mL V = 100 µg/mL Zn = 100 µg/mL