Potassium Bromate Assay by Redox Titrimetry Using Arsenic Trioxide
J M. Smeller, Stefan D. Leigh
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.
and Leigh, S.
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 December 5, 2023)