| http://www.w3.org/ns/prov#value | - These surface active agents can be classified as natural surface active agents such as saponin, nonionic surface active agents such as alkyleneoxide type, glycerin type or glycidol type agents, cationic surface active agents such as higher alkylamines, quaternary ammonium salts, pyridine or other heterocyclic compounds, phosphonium or sulfonium compounds etc., anionic surface active agents contain
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