| http://www.w3.org/ns/prov#value | - As the nonionic surfactants, polyoxyethylene sorbitan fatty acid esters such as a product named Tween 20, polyoxyethylene alkyl ether such as a product named Triron X-100, polyoxyethylene phenyl alkyl ether such as a product named Triton X-405 or the like can be used.
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