ISO 5275:2003

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Petroleum products and hydrocarbon solvents - Detection of thiols and other sulfur species — Doctor test

ISO 5275:2003 is an international standard that specifies a test method, known as the "Doctor test", to detect the presence of thiols (mercaptans), hydrogen sulfide, and elemental sulfur in hydrocarbon solvents and distillate petroleum products, essentially identifying the level of sulfur-containing compounds in these substance