Chemical Stability and Compatibility - Stability of diluted standards
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Assuming the intermediate solution is stored in plastic, preparation in a 5% HNO3/1% HCl matrix should produce a stable solution for all elements except Hg. It’s possible that Hg will be stable, but our experience has been that in a HNO3 only matrix 0.75 ppm Hg will not be stable in a plastic container. Mercury at 0.75 ppm in a 10% HCl matrix is stable when stored in plastic, and it’s possible that the HNO3/HCl mixed matrix will enhance Hg stability, though we suggest performing a stability study to confirm this. Our website has more information regarding Hg stability in different matrices when stored in different container materials (https://www.inorganicventures.com/mercury-chemical-stability). Regarding In, Bi, 6Li, Y, Sc and Tb all at 10 ppb in 3% nitric acid, this solution should be chemically stable indefinitely. |