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This test method covers the determination of total bromine number in various double-bonded aliphatic compounds, using pyridine sulfate dibromide (PSDB), also known as Rosenmund-Kuhnhenn reagent.
This test method is being withdrawn with no replacement because the method uses a mercuric chloride catalyst for the reaction and carbon tetrachloride as a solvent. Test Method 234 closely resembles the iodine number required for biodiesel with the exception of the reaction. The test method as it is written works, but do we want to propagate this test method or replace it with a method that eliminates the mercury waste? Many companies would like to reduce the mercury usage as well as chlorinated solvents in their waste. There are two valid methods wich eliminate the mercury catalyst, D 1159 and D 2710. These methods still require a chlorinated solvent for aliphatic hydrocarbons but do not use mercury.
Formerly under the jurisdiction of Committee E15 on Industrial and Specialty Chemicals and Subcommittee E15.01 on General Standards, this test method was withdrawn in December 2008.
1.1 This test method covers the determination of total bromine number in various double-bonded aliphatic compounds, using pyridine sulfate dibromide (PSDB), also known as Rosenmund-Kuhnhenn reagent. The total unsaturation is determined, whether conjugated or not.
1.2 This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in Section 7 and in paragraphs 5.1.1, 6.4.1, 6.7.1, and 8.1.
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ASTM E234-98(2003)e1, Standard Test Method for Total Bromine Number of Unsaturated Aliphatic Chemicals (Withdrawn 2008), ASTM International, West Conshohocken, PA, 2003, www.astm.orgBack to Top