About: http://webisa.webdatacommons.org/419606735

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	Heavy metals such as lead and mercury are in this category, as are some radioactive isotopes.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com