About: http://webisa.webdatacommons.org/454755196

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	Air-gas mixtures, containing air components or impurities such as an oxide of nitrogen, hydrogen chloride, sulfur dioxide, hydrogen sulfide, mercaptans and amines have heretofore been treated with absorbents for impurity removal.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com