Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Potassium Bromate Assay by Redox Titrimetry Using Arsenic Trioxide

Published

Author(s)

J M. Smeller, Stefan D. Leigh

Abstract

Bromate, a disinfectant, is one of the analytes of interest in wastewater analysis. Environmental laboratories have a regulatory need for their measurements to be traceable to NIST standards. Bromate is not currently certified as a NIST Standard Reference Material (SRM). A traceable assay of potassium bromate (KbrO3) is needed. KbrO3 was dissolved in water and assayed by redox titrimetry using arsenic trioxide (As2O3). A nominal (0.1 g) sample of As2O3 was dissolved in 10 mL of 5 mol/L sodium hydroxide. The solution was acidified with hydrochloric acid, and about 95 % of the KBr(3 titrant was added gravimetrically. The end point was determined by addition of dilute (1:3) titrant using an automated titrator. The KbrO3 assay was determined to be 99.76 % ¿ 0.20 %. The estimated uncertainty considered the titrations of three independently prepared KbrO3 solutions.
Citation
Journal of Research (NIST JRES) - of
Report Number
of

Citation

Smeller, J. and Leigh, S. (2003), Potassium Bromate Assay by Redox Titrimetry Using Arsenic Trioxide, Journal of Research (NIST JRES), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=50806 (Accessed June 13, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created January 31, 2003, Updated October 12, 2021