156 страниц. 2012 год. LAP Lambert Academic Publishing Metals have an impact on human health in many ways. Some elements are essential micronutrients with a human requirement of no more than a few milligrams per day. However, micronutrients may become harmful when their ingestion rates are too high. Some elements are likely to be essential micronutrients, although their positive role in human nutrition. Trace elements are well known as toxic if their intake through ingestion or inhalation is excessive.