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Chemical Stability and Compatibility - Concerns about OsO4 formation in multi-element standards

 
I recently bought some individual standards from IV including Os at 100 ug/mL. I was planning on making an intermediate standard in a 2% HNO3 / 0.5% HCl acid matrix. This will be a multi-element standard at varying concentrations. I'm concerned about the OsO4 formation but I'm wondering if the presence of the other elements along with the 0.5% HCl will minimize this formation.The other elements will be As @ 0.15 ug/mL, Cd @ 0.05 ug/mL, Pb @ 0.10 ug/mL, Hg @ 0.15 ug/mL, Cr @ 2.5 ug/mL, Cu @ 25 ug/mL, Mn @ 25 ug/mL, Mo @ 2.5 ug/mL, Ni @ 2.5 ug/mL, V @ 2.5 ug/mL, Pd @ 1.0 ug/mL, Pt @ 1.0 ug/mL, Os @ 1.0 ug/mL, Rh @ 1.0 ug/mL, Ru @ 1.0 ug/mL, and Ir @ 1.0 ug/mL, This will be used for ICP-MS analysis (specifically the new heavy metals method). The 2% / 0.5% solution is what I hope to introduce to the instrument so I suppose the intermediate standard can be made in HCl only?
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admin Total posts: 529

We do not suggest the addition of any nitric acid. Osmium (Os) will oxidize to the tetroxide - slowly- and the results by ICP will come out very high because of the volatility of the tetroxide and resulting nebulization efficiency approaching 100%. Only use HCl with Os intermediates.

Posted: 09/03/18 22:02:24

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