The bromine Index indicates the amount of unsaturated bonds in petroleum product components. It is defined as the number of milligrams of bromine consumed by 100 g of sample. In this News we introduce an example of bromine index measurement using a coulometric titration Karl Fischer moisture titrator with the one-component inner burette.
The sample is dissolved in a solvent and reacted by changing bromine ions to bromine through electrolytic oxidization. In coulometric titration (coulometry), the amount of reacted bromine is determined from the amount of electricity (coulombs) required for this electrolytic oxidization.
In this application, the one sample solution was measured using Karl Fischer moisture titrator with the two-component and one-component inner burette.
Apparatus
– Equipment Karl Fischer moisture titrator for coulometric method
– Option : Twin platinum electrode, Electrolytic electrode (one-component inner burette)
Reagents
– Anolyte A solution consisting of a mixture of 600 mL of acetic acid, 260 mL of methanol, and 140 mL of 1 mol / L potassium bromide solution.
– Catholyte (used for comparative test) 0.2 mol/L potassium chloride aqueous solution
In the conclusion, the measurement results did not have much difference between two-component or one-component inner burette.
