ASTM D1159 Test Method for Bromine Numbers of Petroleum Distillates
ASTM D1159 Standard Test Method for Bromine Numbers of Petroleum Distillates and Commercial Aliphatic Olefins by Electrometric Titration
4. Summary of Test Method
4.1 A known weight of the specimen dissolved in the selected solvent (see 8.1) maintained at 0 to 5°C (32 to 41°F) is titrated with standard bromide-bromate solution. The end point is indicated by a sudden change in potential on an electrometric end point titration apparatus due to the presence of free bromine.
5. Significance and Use
5.1 The bromine number is useful as a measure of aliphatic unsaturation in petroleum samples. When used in conjunction with the calculation procedure described in Annex A2, it can be used to estimate the percentage of olefins in petroleum distillates boiling up to approximately 315°C (600°F).
5.2 The bromine number of commercial aliphatic monoolefins provides supporting evidence of their purity and identity.
