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
J. Chem. Educ., 1999, 76 (7), p 976
DOI: 10.1021/ed076p976
Publication Date (Web): July 1, 1999
History, Education, and Documentation

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.

Keywords (Audience):

Second-Year Undergraduate

Keywords (Domain):

Analytical Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Quantitative Analysis
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  • Received: August 03, 2009

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