UOP423-85

    Historical Standard: UOP423-85 Thiosulfate in Used Refinery Caustic

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    1. Scope

    This method is for determining thiosulfate ion, S2O3=, in the range of 0.01 to 5 mass-% in used refinery caustic, which may contain sodium salts or phenols, acid oils, naphthenic acids, mercaptans, disulfide oil, Merox catalyst, polysulfides and/or hydrogen sulfide.


    Citing ASTM Standards
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