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standard by UOP LLC, A Honeywell Company, 01/01/1985
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.