Carbon disulphide can be determined at ppm level by converting it into xanthate and then oxidizing it by radiochloramine-T in acid medium. Interference of sulphide, sulphite and nitrite can be eliminated by extracting CS2 from the mixture into carbon tetrachloride and stripping it into aqueous medium as xanthate by the addition of alcoholic KOH to the organic layer.
Hydrogen sulphide at trace level can be determined by radiorelease technique using radiochloramine-T. The minimum detection level is 0.25 ppm. Zinc acetate is used to fix H2S from air samples. CS2 does not interfere. Interference by SO2 can be eliminated by oxidizing it with H2O2.
Authors:I. Pius, Aruna Kadam, M. Rao, V. Rao, and P. Natarajan
Results of experiments on the adsorption of plutonium (IV) on alumina and their application to the recovery of plutonium from analytical waste solutions containing phosphoric-nitric acid are reported. Distribution ratios of plutonium (IV) between alumina and solutions containing varying concentrations of phosphoric acid and nitric acid are determined. The influence of various ions like UO22+, Fe3+, MoO42–, VO2+ and SO42– on the distribution ratio is evaluated. Saturation values of adsorption of plutonium (IV) on alumina and optimum conditions for loading and elution of plutonium on a column packed with alumina are described.
Authors:G. Rama Rao, V. Manchanda, and P. Natarajan
Present work summairzes a method for the estimation of uranium in the presence of plutonium involving the reduction of uranium to U/IV/ and plutonium to Pu/III/ by Zn/Hg/ followed by the selective oxidation of Pu/III/to Pu/IV/with HNO3 catalyzed by molybdate in the presence of large sulphate concenration [5M H2SO4+1.5M /NH4/2SO4]. The oxidation of U/IV/ by K2Cr2O7 is then carried out in the presence of excess of Fe/III/ and Al/NO3/3 to a sharp potentiometric end point. R.S.D. obtained for 20 determinations of uranium /3–6 mg/ was 0.3% in the presence of 0.35 mg of plutonium. Larger quantity for plutonium was found to interfere.
Oxidation of cyclohexanol free from peroxide by carbon tetrachloride under the influence of gamma radiation was carried out both for air saturated and deareated systems. Large values for the formation of HCl are obtained. A kinetic expression consistent with experimental observations has been derived.