About: http://webisa.webdatacommons.org/297863846

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	There are also trace elements, both heavy metals that are of concern, such as lead and cadmium, and those that are considered of nutritional benefit, such as copper, zinc, iron, manganese, and chromium.
http://www.w3.org/ns/prov#wasQuotedFrom	itmonline.org