About: http://webisa.webdatacommons.org/401050607

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	Where apparatuses of PTFE and PFA are used in an ultramicro analysis, if a sample to be analyzed is a metal, a high-pure acid used for dissolving it is contaminated with the major component element.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com