About: http://webisa.webdatacommons.org/438427645

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	In practice I have employed at least about 5 ppm. based on water, such as about 10 to 10,000 ppm. or more such as from about 20 to 5,000 ppm. for example from about 50-500 p.p.m. but preferably about 100-300 p.p.m.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com