Important Notice: Our web hosting provider recently started charging us for additional visits, which was unexpected. In response, we're seeking donations. Depending on the situation, we may explore different monetization options for our Community and Expert Contributors. It's crucial to provide more returns for their expertise and offer more Expert Validated Answers or AI Validated Answers. Learn more about our hosting issue here.
Copper is a naturally occurring metal found in the earth’s crust. Copper is also generally present in surface waters, with cupric ion (Cu+2) as the primary form in natural surface waters. In freshwater systems, naturally occurring concentrations of copper range from 0.2 g/L to 30 g/L (Bowen 1985).
