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  Home > JCE Print > Journal of Chemical Education > Issues > 1999  > July  >
In the Laboratory
A Spectrophotometric Method for Quantitative Determination of Bromine Using Tris(2-carboxyethyl)phosphine
Joan Han, Troy Story, and Grace Han
Morehouse College, Department of Chemistry, Atlanta, GA 30314-3773
Cover
July 1999
Vol. 76 No. 7
p. 976
Abstract
A simple spectrophotometric method for quantitative determination of bromine is described. The sample containing bromine is first incubated with an excess of tris(2-carboxyethyl)phosphine (TCEP). One molecule of TCEP is rapidly and irreversibly oxidized to TCEPO (TCEP oxide) by one molecule of bromine. The concentration of residual TCEP is then measured as 2-nitro-5-thiobenzoate produced by reaction with 5,5'-dithiobis(2-nitrobenzoic acid). This method has a lower detection limit and is more convenient than the standard procedure of bromine assay by reaction with potassium iodide followed by titration of the liberated iodine with thiosulfate.
More Information
*  Citation
 Han, Joan; Story, Troy; Han, Grace. J. Chem. Educ. 1999 76 976.
*  Keywords
 Analytical Chemistry; Laboratory Instruction; Quantitative Analysis; Redox Reactions; Stoichiometry; UV-Vis Spectroscopy; Bromine; Tris(2-carboxyethyl)phosphine; TCEP
*  History
 Created:
Last Updated:		 June 9, 1999
June 23, 2005
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