Chemical Stability and Compatibility - Multi-element standard compatibility and preparation

All of the elements listed can go together except Mo and Sb. Therefore, you'll want to have two blends prepared; the first will consist of Zn, As, Se, Co, Ni, Cu, Ba, Cs, V, Cd, Pb, Cr, Mn, Th, Tl, Pt, W, Be, Pd, and U, while the second will include Mo and Sb by themselves. The matrix of the first blend will be nitric acid at about the 3.5% (abs) concentration level (5% v/v). We will avoid the use of HCl so as to eliminate the ArCl 75 interference upon As. Since yours is an ICP-MS application we recommend 10 µg/mL stock solutions. The second blend will consist exclusively of Mo and Sb in 3.5% nitric acid with a trace of HF. The two blends will mix well and you will achieve good stability. For more information about elemental stability, refer to our Part-Per-Billion Stability Study. This study shows the stability of all of the elements mixed together for a period of 1 year in 1% v/v nitric acid in acid-cleaned (60 °C for ~5 days) LDPE.