Trace amounts of copper are required for good healt. but high concentrations of copper can be toxic. under what conditions might too much copper go into solution?

For example, at atmospheric corrosion of copper:

2Cu + CO₂ + O₂ + H₂O = CuCO₃*Cu (OH) ₂

and disolution of substances of copper in an acid condition:

CuCO₃*Cu (OH) ₂ (s) + 4HNO₃ (aq) = 2Cu (NO₃) ₂ (aq) + CO₂ (g) + 3H₂O (l)

CuCO₃*Cu (OH) ₂ (s) + 4H⁺ = 2Cu²⁺ + CO₂ + 3H₂O