Bromine Index – clean and elegant – A more clean, elegant and accurate determination of the Bromine Index is the coulometric method. Here the Bromine is not added in solution with a burette, but generated directly in the titration vessel by a current applied by an electrolysis cell. Fewer chemicals need to be handled and the current generates Bromine even more accurately than a typical burette could dose a solution. Typical industry samples are in the Bromine Index range of 2 to 50 for clean aromatic samples such as Benzene, Toluene, or Xylene. Raffinates, which are cracked hydrocarbons destined for gasoline, can be much higher, several hundred to several thousand. The METTLER TOLEDO Coulometer C30 determines the water content of a variety of sample of the petrochemical industry according to Karl Fischer. It also offers a dedicated method for the fast and accurate determination of Bromine Index. The control is fast for high Bromine Index values and cautious for small values. This allows accurate and reproducible determination of even low one-digit Bromine Indices. The simple method allows determinations without much method development, as the predefined method template can be applied. The solvent is blanked out and subsequent samples analyzed all with the same method.