About: http://webisa.webdatacommons.org/324866518

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	Some heavy metals, such as iron, zinc and copper, are necessary nutrients for humans, but others, such as mercury and lead, can be toxic in high concentrations.
http://www.w3.org/ns/prov#wasQuotedFrom	columbiamissourian.com