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 December 26, 2024)
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Potassium Bromate Assay by Redox Titrimetry Using Arsenic Trioxide
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Author(s)
J M. Smeller,
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
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Created January 31, 2003, Updated October 12, 2021