ASTM D5776-14a,Standard Test Method for Bromine Index of Aromatic Hydrocarbons by Electrometric Titration.
This standard  pdf can be downloaded.Its size is 502K.
ASTM D5776-14a determines the amount of bromine-reactive material in aromatic hydrocarbons and is thus a measure of trace amounts of unsaturates in these materials.
Summary of Test Method
The specimen dissolved in a specified solvent is titrated with standard bromide-bromate solution. The end point is indicated by a fixed end-point electrometric titration apparatus,when the presence of free bromine causes a sudden change in the polarization voltage of the system.
Reagents and materials
Purity of Reagents-Reagent grade chemicals shall be used in all tests. Unless otherwise indicated, it is intended that all reagents shall conform to the specifications of the American Chemical Society where such specifications are available. Other grades may be used, providing it is first ascertained that the reagent is of suficiently high purity to permit its use without lessening the accuracy of the determination.
ASTM D5776-14a pdf is free to download on www.freestandardsdownload.com

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