| http://www.w3.org/ns/prov#value | - The usable surfactant includes, for example, nonionic surfactants such as polyoxyethylene alkyl ethers (e.g., polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether and the like), poly-oxyethylene alkyl phenol ethers (e.g., polyoxyethylene octyl phenol ether, polyoxyethylene nonyl phenol ether and the like), polyethylene glycol dialkyl ethers (e.g., polyethylene g
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