<http://webisa.webdatacommons.org/prov/59694921>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/66171282> .
<http://webisa.webdatacommons.org/66171282>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<slideshare.net> .
<http://webisa.webdatacommons.org/66171282>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/66171282>	<http://www.w3.org/ns/prov#value>	"Therefore, in nature, water always contains chemicals and biological impurities i.e. suspended and dissolved inorganic and organic compounds and micro organisms." .