Record Details

Simultaneous spectrophotometric determination of barium and strontium using sulfonazo III

ScholarsArchive at Oregon State University

Field Value
Title Simultaneous spectrophotometric determination of barium and strontium using sulfonazo III
Names Kemp, Paul James (creator)
Williams, Max B. (advisor)
Date Issued 1969-03-18 (iso8601)
Note Graduation date: 1969
Abstract A simultaneous direct spectrophotometric method for the determination
of barium and strontium using Sulfonazo III has been developed
making use of the chelons EGTA and CDTA at controlled pH
values.
An absorbance study of the barium and strontium complexes of
Sulfonazo III revealed that there is no pH sensitivity of the complexes
in the pH range 2 6 to 7.7. The addition of the chelons EGTA and
CDTA at pH 6 eliminates the interference of all cations except copper
which has a light blue chelon complex. The use of EGTA at pH 6.1
and CDTA at pH 5.8 permits the determination of barium and strontium
by simultaneous equations derived from Beer's law. The working
range for the method is 1.0 to 3.0 X 10⁻⁵ M (1.4 to 4.1 ppm) for
barium and 2.0 to 8.0 X 10⁻⁵ M (1.8 to 7.0 ppm) for strontium.
An aqueous solution of Sulfonazo III shows less than 1% decomposition
in seven days, and when it is calibrated sufficiently often,
its usefulness as an analytical reagent is not impaired for at least
several months. Under these conditions the determination has an
accuracy of less than 2% error,
The properties of the free reagent were also investigated, and it
was found that Sulfonazo III could be isolated at 99.7% purity by purification
with ion exchange resin, and carefully controlled drying.
Pure solid Sulfonazo III decomposes sharply at 222° C, is soluble in
water and water miscible alcohols, and is insoluble in non-polar
organic solvents.
Genre Thesis/Dissertation
Topic Barium
Identifier http://hdl.handle.net/1957/46350

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