About: http://webisa.webdatacommons.org/29211537

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	After treating silt the precipitate is rich in heavy (poisonous) metals, such as Cd, Cu and other toxic metals such as Pb and Hg, either in their metallic form or as tightly bound salt.
http://www.w3.org/ns/prov#wasQuotedFrom	citizendium.org