Open AccessI. DIRECT TITRATION OF SULFATE. II. HIGH PRECISION SPECTROPHOTOMETRIC ANALYSIS
Author(s) -
M.Q. Freeland,
James S. Fritz
Publication year - 1955
Publication title -
osti oai (u.s. department of energy office of scientific and technical information)
Language(s) - English
Resource type - Reports
DOI - 10.2172/4363815
Subject(s) - titration , sulfate , chemistry , uranium , uranyl , barium sulfate , inorganic chemistry , coefficient of variation , fluoride , titration curve , chloride , analytical chemistry (journal) , chromatography , materials science , metallurgy , organic chemistry
A method is proposed in which sulfate is titrated directly with standard barium solution. The end point is indicated by the adsorption of Alizarin Red S or Thorin onto the barium sulfate with a distinct color change from yellow to pink. The sulfate sample must contain 30 to 40% methanol for these indicators. Coprecipitation errors are greater than for gravimetric sulfate methods, but most of these can be avoided by the preliminary removal of cations with an ion exchange column. In the absence of interfering anions, the ion exchange-titrimetric method is as precise as the gravimetric method and considerably faster.
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