About: http://webisa.webdatacommons.org/296311031

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	However, heavy metals such as Hg, As, Pb, and Cd are highly toxic and carcinogenic, even at the trace level [1, 2].
http://www.w3.org/ns/prov#wasQuotedFrom	hindawi.com