Graduate Thesis Or Dissertation
 

Simultaneous spectrophotometric determination of barium and strontium using sulfonazo III

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  • 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.
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