<http://webisa.webdatacommons.org/prov/373333689>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/420251255> .
<http://webisa.webdatacommons.org/420251255>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.fr> .
<http://webisa.webdatacommons.org/420251255>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/420251255>	<http://www.w3.org/ns/prov#value>	"In addition, reactive blanking agents, such as trialkylaluminum compounds, alkali metals and metal alloys, especially Na/K, may be used to remove impurities." .