About: http://webisa.webdatacommons.org/279344476

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	Sodium, calcium, magnesium, iron, aluminum, copper, arsenic, lead and mercury are examples of positive ions or cations; chloride, fluoride, sulfate, nitrate, bicarbonate and silicate are examples of negative ions or anions.
http://www.w3.org/ns/prov#wasQuotedFrom	audiogon.com