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本方法是在美国ASTM的D2710—72“电滴定法测定石汕烃的溴捐数”这个方法的基础上改进得来的。本方法的主要改进是采用了直流微安表作为电滴定的终点指示装置。另外,在测定低烯烃浓度的试样时,溶剂中预先滴加少量溴化钾水溶液。由于这些改进,本方法的仪器较简单,终点指示较明显,被测试样的溴指数的低限亦得到了扩展。
This method is based on the United States ASTM D2710-72 “electric titration Determination of bromine number of Shishan Shantou” This method is improved. The main improvement of this method is the use of DC micro-ampere meter as the end of the titration device. In addition, when a sample having a low olefin concentration is measured, a small amount of potassium bromide aqueous solution is previously added dropwise to the solvent. Due to these improvements, the method of the instrument is relatively simple, the end indication is more obvious, the lower limit of the bromine index of the sample has been expanded.