The book "Élément-trace Métallique" by Alphascript Publishing offers a comprehensive analysis of the concept of metallic trace elements, also known as ETM. This scholarly literature highlights the challenges associated with defining and understanding these elements and addresses the uncertainties present in the scientific and legal communities. The content is based on high-quality information, providing a solid foundation for readers interested in the effects of metallic trace elements on the environment and health. The book was published in 2010 and is aimed at an audience interested in mathematics and natural sciences. It is available in a paperback edition and offers a critical perspective on a topic often seen as vague and unclear.