High precision constant current coulometric assay of primary standard oxidizing agents
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High Precision Coulometric Titration of Uranium
An improved method for the coulometric assay of uranium and uranium oxide has been developed based on the electrogeneration of Tif II in H2SO,, using Fe(lI) as a catalyst. The endpoint is determined amperometrically. Hydrogen peroxide is used as the oxidant in the dissolution of the uranium to avoid interferences from nitrate. The precision of the method as indicated by the standard deviation o...
متن کاملEvaluation of the stability of iron(II) solutions by precise coulometric titration with electrogenerated cerium(IV).
An iron(II) solution is often used as a reducing agent in titrimetry and standardized with cerium(IV) or potassium dichromate. Such an iron(II) standard solution is needed for not only titrimetric analyses, but also instrumental ones. Iron(II) is unstable even in a highly acidic solution, mainly due to air-oxidation; therefore, its standardization is required before use. In the present study...
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A highly precise coulometer is described which permits time integration of currents totaling 100 coulombs or more with a precision of about 1 part in 100,000. The current to be integrated oxidizes hydroquinone in an electrolysis cell, producing quinone and acid. The quinone is t hen reduced by constant-current coulometric titration, the end point being indicated by hydrogen-ion concentration me...
متن کاملPrecise Coulometric Titrations of Halides
The determination of halides is of interest in many chemical investigations. For example, in a recent determination of the atomic weight of chlorine[l] * it was necessary to determine the chloride content of dilute solutions with high precision. For such applications, coulometric titration is particularly advantageous because it involves a minimum of manipulation. A further advantage is that th...
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