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I have an unknown sample of mineral which I need to dissolve in nitric acid. I need to analyze $\ce{Cu}$ from it on MP-AES. Do I need to add $\pu{1ml}$ of $\ce{HCl}$ to stabilize $\ce{Cu}$, or it is enough just $\ce{HNO3}$?

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This procedure from an MP-AES manufacturer features copper analysis (among other elements) without the use if hydrochloric acid. Hydrogen peroxide is used in this procedure but would not affect the extraction of copper. A copper standard is also available in "5% nitric acid" solution from the same company.

So the people who are selling this technology do not believe hydrochloric acid is needed for copper analysis, you can try nitric acid alone if this gets your sample to dissolve.

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