Chemical Stability and Compatibility - Different acid concentrations for CRMs
We've used 2 CRMs from a different company that are in 2% HNO3. You have corresponding solutions in 0.1 % (1000 ppm K) and 3% HNO3 (1000 ppm Mn). Could you please explain why you are using different concentrations of acid and how will this affect our analysis?
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admin
Total posts: 529
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The different acid concentrations, for either the IV or other companies products, should have no discernible effect upon the chemical stability of any of the solutions, and any analysis should not be affected as long as the standards and samples are matrix matched. We use a lower acid concentration for the K product as higher concentrations are not necessary, and in a 0.1% HNO3 matrix the standard can ship as a non-hazardous substance, significantly lowering shipping costs. We can certainly provide either of the standards in 2% HNO3, with no adverse effects upon the quality or stability of the solutions.
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