Chemical Stability and Compatibility - Silver (Ag) stability in multi-element standards with chloride
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The Ag present in IV-ICPMS-71A will not be stable in the presence of Cl (chloride), unless an excess of chloride is present (typically as HCl). For reference, a 10 ug/mL solution of Ag is stable in a minimum of 10% (v/v) HCl (please see http://inorganicventures.com/silver-chemical-stability for more information). If you eliminate Cl from your standard mixture (e.g., your Pb standards), please be aware that Pt (and other precious metals) can also cause Ag stability issues, as they often are prepared/stabilized in HCl. In other words, even though your final matrix is HNO3, trace chloride present from other elements can also create Ag stability issues. If you wish to measure Pt in the presence of Ag, and assuming no other sources of chloride are present, we do offer a chloride-free Pt product (CGPTNO31) that can be combined with Ag to produce a stable mixture in HNO3. |