“…Two of these have already been accomplished and are commercially available, i.e., the MURST-ISS-A1 Antarctic Sediment, certified for the content of Al, As, Cd, Co, Cr, Fe, Mn, Ni, Pb and Zn, and the MURST-ISS-A2 Antarctic Krill, certified for the content of As, Cd, Co, Cu, Fe, Mn, Ni, Pb, Se and Zn [2][3][4][5]. Other candidate CRMs (e.g.…”