About: http://webisa.webdatacommons.org/131131088

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	One may use purification techniques such as chromatography, crystallization, thermal diffusion techniques, zone refining, progressive recrystallization, size separation and the like.
http://www.w3.org/ns/prov#wasQuotedFrom	google.ca