What items will your scrap yard not take?

Originally Posted by ecogeek

The yard I'm going to won't take circuit boards or burnt #2 copper. Really, though, I've found that soaking my rough looking copper in a citric acid solution (Citric acid is easily available at wallyworld), shines it up and cleans it nice.

Yes but if your burning the copper then your releasing all kinds of dangerous chemicals into the atmosphere.

Low-temperature burning releases contaminants into the air, water and soil including dioxins,
furans, polycyclic aromatic hydrocarbons, particulate matter, heavy metals (such as lead,
arsenic, selenium and cadmium) and other pollutants. The contaminants often end up in the
air, in the ash on the ground or as pollutants in the soil and water. Wind or water may carry
the pollutants significant distances from a burn site. Elevated concentrations of the pollutants
are harmful to human health and the environment. The effects of these pollutants on people
can be chronic or acute and can range from lung irritation to cardiac problems or even an
increased risk of cancer.