DIN ISO 5275:2005 PDF

Scope: This International Standard specifies a procedure (Doctor test) for the detection of thiols (mercaptans), hydrogen sulfide and elemental sulfur in hydrocarbon solvents and distillate petroleum feedstocks and products. Preliminary procedures also detect the presence of peroxides and phenolic substances, which, when present in more than trace quantities, make the application of this International Standard inappropriate. Carbon disulfide, at relatively high concentrations [above 0,4 % (m/m) sulfur], also interferes with the interpretation of the test by causing darkening of the aqueous layer. NOTE For the purposes of this International Standard, the term "% (m/m)" is used to represent the mass fraction of a material. The test is a go/no-go procedure with a threshold value of thiol concentration dependent on the material under test. It is frequently used as a substitute for the quantitative determination of thiol content.

DIN ISO 5275:2005 Referenced Document

ISO 1995:1981 Aromatic hydrocarbons; Sampling
ISO 3170 Petroleum liquids - Manual sampling
ISO 3171:1988 Petroleum liquids; automatic pipeline sampling
ISO 3696:1987 Water for analytical laboratory use; Specification and test methods

2005 DIN ISO 5275:2005-10 Petroleum products and hydrocarbon solvents - Detection of thiols and other sulfur species - Doctor test (ISO 5275:2003)
2005 DIN ISO 5275:2005 Petroleum products and hydrocarbon solvents - Detection of thiols and other sulfur species - Doctor test (ISO 5275:2003)
0000 DIN ISO 5275:1987