Chemical Stability and Compatibility - Metal stability in trace acid
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We’re assuming that all of the metal standards purchased are in HNO3, and the good news is that nitrates of these metals are all soluble in water, though Sb typically requires some fluoride as a complexing ligand. If the solution is prepared and used immediately, then order of addition should not matter too much at these concentrations levels, though our greatest concerns regarding instability would concern: 1) Ag in the presence of chlorine, 2) Hg in the presence of plastics at low (<10 ppm) concentrations, and 3) at circum-neutral pH values many cationic metals can form insoluble compounds with As and Se. |