<http://webisa.webdatacommons.org/274072695>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<orionmagazine.org> .
<http://webisa.webdatacommons.org/274072695>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/36070785>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/274072695> .
<http://webisa.webdatacommons.org/prov/33012907>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/274072695> .
<http://webisa.webdatacommons.org/274072695>	<http://www.w3.org/ns/prov#value>	"Hydrofluosilicic acid (fluoride) is never purified and is allowed to contain trace amounts of lead, mercury, arsenic and other toxins." .