# Is Cu stable as Cu(H2O)2+ for determination on MP-AES? [closed]

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 $$\ce{HNO3}$$?