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  • Author or Editor: A. Bedekar x
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Abstract  

Radiation decomposition studies of quenched pure KNO3 and KNO3 doped with Ba2+ ions in the presence of PbO or Al2O3 as a heterophase impurity showed that the yield of nitrite varied with the particle size of the nitrate. The G/NO 2 / values were also found to vary with the mol percent of PbO or Al2O3 in the mixture. Higher yields of nitrite were obtained in the presence of PbO, while in mixtures containing Al2O3, the yields of nitrite were lower in comparison with the G-values observed in the absence of oxide. These results are explained on the basis that a larger surface area results in an increased energy transfer at the interface between two neighbouring particles. The results can also be accounted for in terms of electron donor-acceptor properties of the added oxides.

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Abstract  

Gamma-radiolysis of aqueous sodium nitrate and nitrate-1-propanol solutions has been studied as a function of concentration of reactants and absorbed dose. The three major products analyzed are nitrite, hydrogen peroxide and propionaldehyde in aerated and deoxygenated solutions. The concentration of the products formed were found to be proportional to the absorbed dose. The G-values of the different products obtained over a wide range of reactant concentrations are explained on the basis of an appropriate reaction mechanism.

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Abstract  

Radiolysis of isobutanol-nitrate aqueous solutions has been investigated in both aerated and deoxygenated solutions. Nitrate acts as a good scavenger for hydrated electrons. It gets reduced to nitrite during radiolysis. Alcohol, on the other hand, is used as a hydroxyl radical scavenger leading to the formation of aldehyde as the stable product. Nitrite, aldehyde and hydrogen peroxide formed as the stable products have been estimated in each system. Concentrations of both species (nitrate and alcohol) in the aqueous solution affect the yield of the products significantly. The observed G-values of the different products are accounted for by the mechanism proposed.

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Abstract  

The studies of radiation decomposition of ammonium nitrate in the presence of MnO2, PbO and V2O5 with the absorbed dose reveal that MnO2 retards while PbO and V2O5 accelerate the rate of radiolysis. G/NO 2 / values were found to increase with the mole% of V2O5 in an admixture. The results are explained on the basis of electron donor-acceptor properties of oxides affecting the equilibrium concentration of electrons present in pure ammonium nitrate in the presence of the added oxides.

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Abstract  

Gamma-radiolysis of alkaline binary mixtures of nitrate-alcohol (1-propanol and 1-butanol) has been investigated at a fixed pH of 12. The products of radiolysis, mainly nitrite, aldehyde and hydrogen peroxide were estimated. Also the effect of concentration of each species present in the mixture on the G-values of the products formed has been examined. The G-values of each of the products are found to be lower in basic medium in binary mixtures as compared to those obtained at neutral pH; other conditions being kept constant. However, the yields of products in nitrate solutions show higher values at basic pH in comparison with their counterparts at neutral pH. Results are explained on the basis of reaction mechanism that operates during the process of radiolysis, leading to the formation of the different products.

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