Meat products and soil pollution caused by livestock and poultry feed additive in Liaoning, China.

Contents of copper and zinc in feed, manure, meat of livestock and poultry, and soil applied with manure in Liaoning, China were determined by atomic absorption spectrometry. The average contents of copper in chicken and pork were exceed the maximum limit values provides by Chinese standard GB15199-94. The application of pig and chicken manure has led to a certainty extend pollution of copper and zinc in soil, which becomes severity in the release of heavy metals in plantation.